Handle Must Be Valid Exception Xamarin - xamarin

I am working on an android app using Xamarin and receive the following exception.
Xamarin caused by: android.runtime.JavaProxyThrowable: System.ArgumentException: Handle must be valid.
Parameter name: instance
at Java.Interop.JniEnvironment+InstanceMethods.CallVoidMethod (Java.Interop.JniObjectReference instance, Java.Interop.JniMethodInfo method, Java.Interop.JniArgumentValue* args) [0x0000d] in <1bc3ec2e392f4f1a8cde1c9a163d2a4a>:0
at Android.Runtime.JNIEnv.CallVoidMethod (System.IntPtr jobject, System.IntPtr jmethod, Android.Runtime.JValue* parms) [0x0000e] in <0ce7e7a03dfb4c4b87eaf38b0e480d65>:0
at Android.Support.V4.Widget.SwipeRefreshLayout.set_Refreshing (System.Boolean value) [0x00060] in <27c17fe440cf491ba8255bcefade6e02>:0
at Xamarin.Forms.Platform.Android.ListViewRenderer.<UpdateIsRefreshing>b__25_0 () [0x00000] in <a3e44144fef249b0888b761605dfca24>:0
at Java.Lang.Thread+RunnableImplementor.Run () [0x0000b] in <0ce7e7a03dfb4c4b87eaf38b0e480d65>:0
at Java.Lang.IRunnableInvoker.n_Run (System.IntPtr jnienv, System.IntPtr native__this) [0x00009] in <0ce7e7a03dfb4c4b87eaf38b0e480d65>:0
at (wrapper dynamic-method) System.Object:ffc21647-8320-4065-b329-c8e7939eb92d (intptr,intptr)
at mono.java.lang.RunnableImplementor.n_run(Native Method)
at mono.java.lang.RunnableImplementor.run(RunnableImplementor.java:30)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
I've tried adding a txt file, environment.txt, with the property to set the GC to old. However that did not work.
What other issues could cause this exception?

Related

System.TypeLoadException Message=VTable setup of type Prism.Autofac.AutofacContainerExtension failed

After update to xamarin forms 3.6->4.2, prism.Autofac.Forms 7.0->7.1, and xamarin.android.support.% 28.0.0.1->28.0.0.3 I'm getting
System.TypeLoadException
Message=VTable setup of type Prism.Autofac.AutofacContainerExtension failed
stack trace:
at Prism.PrismApplicationBase.Initialize () [0x00000] in d:\a\1\s\Source\Xamarin\Prism.Forms\PrismApplicationBase.cs:130
at Prism.PrismApplicationBase.InitializeInternal () [0x00006] in d:\a\1\s\Source\Xamarin\Prism.Forms\PrismApplicationBase.cs:84
at Prism.PrismApplicationBase..ctor (Prism.IPlatformInitializer platformInitializer, System.Boolean setFormsDependencyResolver) [0x00038] in d:\a\1\s\Source\Xamarin\Prism.Forms\PrismApplicationBase.cs:75
at Prism.PrismApplicationBase..ctor (Prism.IPlatformInitializer platformInitializer) [0x00000] in d:\a\1\s\Source\Xamarin\Prism.Forms\PrismApplicationBase.cs:57
at Prism.Autofac.PrismApplication..ctor (Prism.IPlatformInitializer platformInitializer) [0x00000] in D:\a\1\s\Source\Xamarin\Prism.Autofac.Forms\PrismApplication.cs:30
at DisMobi.App..ctor (Prism.IPlatformInitializer initializer) [0x00000] in C:...........\App.xaml.cs:28
at xxxxxx.Droid.MainActivity.OnCreate (Android.OS.Bundle bundle) [0x00079] in C:..........\xxxxxx.Android\MainActivity.cs:35
at Android.App.Activity.n_OnCreate_Landroid_os_Bundle_ (System.IntPtr jnienv, System.IntPtr native__this, System.IntPtr native_savedInstanceState) [0x00011] in :0
at (wrapper dynamic-method) Android.Runtime.DynamicMethodNameCounter.3(intptr,intptr,intptr)

No constructor found in exception but class has the exact constructor

I am sometimes getting the following exception:
Unhandled Exception: Android.Runtime.JavaProxyThrowable: Exception of type 'Android.Runtime.JavaProxyThrowable' was thrown.
--- End of managed Android.Runtime.JavaProxyThrowable stack trace ---
android.runtime.JavaProxyThrowable: System.NotSupportedException: Unable to activate instance of type TaxiTabletUniversal.Droid.Views.SoftMeterView from native handle 0xbe8cfb2c (key_handle 0x369e8281). ---> System.MissingMethodException: No constructor found for TaxiTabletUniversal.Droid.Views.SoftMeterView::.ctor(System.IntPtr, Android.Runtime.JniHandleOwnership) ---> Java.Interop.JavaLocationException: Exception of type 'Java.Interop.JavaLocationException' was thrown.
--- End of inner exception stack trace ---
at Java.Interop.TypeManager.CreateProxy (System.Type type, System.IntPtr handle, Android.Runtime.JniHandleOwnership transfer) [0x00054] in <5ade030ddd6b4e4c9dda56516f1de4fe>:0
at Java.Interop.TypeManager.CreateInstance (System.IntPtr handle, Android.Runtime.JniHandleOwnership transfer, System.Type targetType) [0x00111] in <5ade030ddd6b4e4c9dda56516f1de4fe>:0
--- End of inner exception stack trace ---
at Java.Interop.TypeManager.CreateInstance (System.IntPtr handle, Android.Runtime.JniHandleOwnership transfer, System.Type targetType) [0x0017d] in <5ade030ddd6b4e4c9dda56516f1de4fe>:0
at Java.Lang.Object.GetObject (System.IntPtr handle, Android.Runtime.JniHandleOwnership transfer, System.Type type) [0x000b9] in <5ade030ddd6b4e4c9dda56516f1de4fe>:0
at Java.Lang.Object._GetObject[T] (System.IntPtr handle, Android.Runtime.JniHandleOwnership transfer) [0x00017] in <5ade030ddd6b4e4c9dda56516f1de4fe>:0
at Java.Lang.Object.GetObject[T] (System.IntPtr handle, Android.Runtime.JniHandleOwnership transfer) [0x00000] in <5ade030ddd6b4e4c9dda56516f1de4fe>:0
at Java.Lang.Object.GetObject[T] (System.IntPtr jnienv, System.IntPtr handle, Android.Runtime.JniHandleOwnership transfer) [0x00006] in <5ade030ddd6b4e4c9dda56516f1de4fe>:0
at Android.Views.ViewTreeObserver+IOnGlobalLayoutListenerInvoker.n_OnGlobalLayout (System.IntPtr jnienv, System.IntPtr native__this) [0x00000] in <5ade030ddd6b4e4c9dda56516f1de4fe>:0
at (wrapper dynamic-method) System.Object.90422e09-526e-4347-b02e-8c2980bde53e(intptr,intptr)
at mvvmcross.droid.views.MvxActivity.n_onGlobalLayout(Native Method)
at mvvmcross.droid.views.MvxActivity.onGlobalLayout(MvxActivity.java:84)
at android.view.ViewTreeObserver.dispatchOnGlobalLayout(ViewTreeObserver.java:986)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2221)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1306)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:7031)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:821)
at android.view.Choreographer.doCallbacks(Choreographer.java:606)
at android.view.Choreographer.doFrame(Choreographer.java:576)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:807)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:145)
at android.app.ActivityThread.main(ActivityThread.java:6914)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1404)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1199)
with the bit that stands out from that exception saying :
No constructor found for TaxiTabletUniversal.Droid.Views.SoftMeterView::.ctor(System.IntPtr, Android.Runtime.JniHandleOwnership)
But the class SoftmeterView (derived from MvxActivity) does have 2 constructors:
public SoftMeterView() : base()
{
MoveTaskToBack(true);
IsCreated = true;
}
with the second one matching the exact signature the exception is complaining about:
public SoftMeterView(IntPtr javaReference, JniHandleOwnership transfer) : base(javaReference, transfer)
{
MoveTaskToBack(true);
IsCreated = true;
}
any thoughts ?

Xamarin Forms default contructor not found for type on namespace.ShowOverlay

I am trying to implement Overlay view from the Link. In android it is working fine but showing System.MissingMethodException on UIApplication.Main(args, null, "AppDelegate");
Upadated
System.MissingMethodException: Default constructor not found for type VenkysHRMS.iOS.ShowOverlay
at System.RuntimeType.CreateInstanceMono (System.Boolean nonPublic) [0x00066] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.9.1.24/src/Xamarin.iOS/mcs/class/corlib/ReferenceSources/RuntimeType.cs:171
at System.RuntimeType.CreateInstanceSlow (System.Boolean publicOnly, System.Boolean skipCheckThis, System.Boolean fillCache, System.Threading.StackCrawlMark& stackMark) [0x00009] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.9.1.24/src/Xamarin.iOS/mcs/class/corlib/ReferenceSources/RuntimeType.cs:153
at System.RuntimeType.CreateInstanceDefaultCtor (System.Boolean publicOnly, System.Boolean skipCheckThis, System.Boolean fillCache, System.Threading.StackCrawlMark& stackMark) [0x00027] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.9.1.24/src/Xamarin.iOS/mcs/class/referencesource/mscorlib/system/rttype.cs:5639
at System.Activator.CreateInstance (System.Type type, System.Boolean nonPublic) [0x00039] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.9.1.24/src/Xamarin.iOS/mcs/class/referencesource/mscorlib/system/activator.cs:201
at System.Activator.CreateInstance (System.Type type) [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.9.1.24/src/Xamarin.iOS/mcs/class/referencesource/mscorlib/system/activator.cs:134
at Xamarin.Forms.DependencyService.Get[T] (Xamarin.Forms.DependencyFetchTarget fetchTarget) [0x00065] in C:\BuildAgent3\work\ca3766cfc22354a1\Xamarin.Forms.Core\DependencyService.cs:35
at VenkysHRMS.View.Login+<OnCreate>d__2.MoveNext () [0x0001b] in /Users/mac/Desktop/VenkysHRMS/VenkysHRMS/VenkysHRMS/View/Login.xaml.cs:33
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000c] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.9.1.24/src/Xamarin.iOS/mcs/class/referencesource/mscorlib/system/runtime/exceptionservices/exceptionservicescommon.cs:152
at System.Runtime.CompilerServices.AsyncMethodBuilderCore+<>c.<ThrowAsync>b__6_0 (System.Object state) [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.9.1.24/src/Xamarin.iOS/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1018
at UIKit.UIKitSynchronizationContext+<Post>c__AnonStorey0.<>m__0 () [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.9.1.24/src/Xamarin.iOS/UIKit/UIKitSynchronizationContext.cs:24
at Foundation.NSAsyncActionDispatcher.Apply () [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.9.1.24/src/Xamarin.iOS/Foundation/NSAction.cs:163
at at (wrapper managed-to-native) UIKit.UIApplication.UIApplicationMain(int,string[],intptr,intptr)
at UIKit.UIApplication.Main (System.String[] args, System.IntPtr principal, System.IntPtr delegate) [0x00005] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.9.1.24/src/Xamarin.iOS/UIKit/UIApplication.cs:79
at UIKit.UIApplication.Main (System.String[] args, System.String principalClassName, System.String delegateClassName) [0x00038] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.9.1.24/src/Xamarin.iOS/UIKit/UIApplication.cs:63
at VenkysHRMS.iOS.Application.Main (System.String[] args) [0x00001] in /Users/mac/Desktop/VenkysHRMS/VenkysHRMS/VenkysHRMS.iOS/Main.cs:17

what does "android.runtime.JavaProxyThrowable" mean ? How can I solve it?

I am getting the following in the Play console. I don't know what JavaProxyThrowable means. How can I find out what the error means and fix it?
android.runtime.JavaProxyThrowable:
at DiabeticNow.MainActivity+<>c__DisplayClass3_0.<OnCreate>b__1 (System.Object <p0>, System.EventArgs <p1>) [0x01744] in <dabfa6ee96644f0a980241e8b5bd1c61>:0
at Android.Views.View+IOnClickListenerImplementor.OnClick (Android.Views.View v) [0x00011] in <794f2773dcf94ef592cfddeec7272681>:0
at Android.Views.View+IOnClickListenerInvoker.n_OnClick_Landroid_view_View_ (System.IntPtr jnienv, System.IntPtr native__this, System.IntPtr native_v) [0x0000f] in <794f2773dcf94ef592cfddeec7272681>:0
at (wrapper dynamic-method) System.Object:04a4eea7-8182-4d20-9207-17bd8bcbd598 (intptr,intptr,intptr)
at mono.android.view.View_OnClickListenerImplementor.n_onClick (Native Method)
at mono.android.view.View_OnClickListenerImplementor.onClick (View_OnClickListenerImplementor.java:30)
at android.view.View.performClick (View.java:6261)
at android.widget.TextView.performClick (TextView.java:11159)
at android.view.View$PerformClick.run (View.java:23748)
at android.os.Handler.handleCallback (Handler.java:751)
at android.os.Handler.dispatchMessage (Handler.java:95)
at android.os.Looper.loop (Looper.java:154)
at android.app.ActivityThread.main (ActivityThread.java:6776)
at java.lang.reflect.Method.invoke (Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run (ZygoteInit.java:1496)
at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:1386)
It looks like this is a method that Xamarin uses to turn C# exceptions into Java exceptions. There seems to be details of where the problem might be in your C# code:
DiabeticNow.MainActivity+<>c__DisplayClass3_0.b__1 (System.Object , System.EventArgs ) [0x01744] in :0
at Android.Views.View+IOnClickListenerImplementor.OnClick (Android.Views.View v) [0x00011] in <794f2773dcf94ef592cfddeec7272681>:0
at Android.Views.View+IOnClickListenerInvoker.n_OnClick_Landroid_view_View_ (System.IntPtr jnienv, System.IntPtr native__this, System.IntPtr native_v) [0x0000f] in ...
If you posted the relevant c# code and tagged with C# someone might be able to help.

Xamarin.Android using MvvmCross crashes on Activity launch

I am currently developing a Xamarin app and all of a sudden my Android app started crashing on LoginActivity. I have researched a lot on "
Java.Lang.ClassNotFoundException: Didn't find class
"android.support.v7.appcompat.R$styleable" on path
"
Tried things like updating Android SDK, deleting bin and obj folder. Looking at stacktrace it seems to be an issue with MvvmCross. Currently I am using 3.5.1 of MvvmCross.
Another fact is that I am the only one in team who is facing this issue.
[MonoDroid] UNHANDLED EXCEPTION:
[MonoDroid] Java.Lang.NoClassDefFoundError: Failed resolution of: Landroid/support/v7/appcompat/R$styleable; ---> Java.Lang.ClassNotFoundException: Didn't find class "android.support.v7.appcompat.R$styleable" on path: DexPathList[[zip file "/data/app/org.cancer.fundraising-1/base.apk"],nativeLibraryDirectories=[/data/app/org.cancer.fundraising-1/lib/x86, /vendor/lib, /system/lib]]
[MonoDroid] --- End of managed exception stack trace ---
[MonoDroid] java.lang.ClassNotFoundException: Didn't find class "android.support.v7.appcompat.R$styleable" on path: DexPathList[[zip file "/data/app/org.cancer.fundraising-1/base.apk"],nativeLibraryDirectories=[/data/app/org.cancer.fundraising-1/lib/x86, /vendor/lib, /system/lib]]
[MonoDroid] at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
[MonoDroid] at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
[MonoDroid] at java.lang.ClassLoader.loadClass(ClassLoader.java:469)
[MonoDroid] at android.support.v7.app.AppCompatDelegateImplBase.onCreate(AppCompatDelegateImplBase.java:118)
[MonoDroid] at android.support.v7.app.AppCompatDelegateImplV7.onCreate(AppCompatDelegateImplV7.java:146)
[MonoDroid] at android.support.v7.app.AppCompatActivity.onCreate(AppCompatActivity.java:59)
[MonoDroid] at md5da1044ae077a2d5a79e87e5c6bedf113.LoginActivity.n_onCreate(Native Method)
[MonoDroid] at md5da1044ae077a2d5a79e87e5c6bedf113.LoginActivity.onCreate(LoginActivity.java:31)
[MonoDroid] at android.app.Activity.performCreate(Activity.java:5990)
[MonoDroid] at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
[MonoDroid] at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2278)
[MonoDroid] at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387)
[MonoDroid] at android.app.ActivityThread.access$800(ActivityThread.java:151)
[MonoDroid] at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)
[MonoDroid] at android.os.Handler.dispatchMessage(Handler.java:102)
[MonoDroid] at android.os.Looper.loop(Looper.java:135)
[MonoDroid] at android.app.ActivityThread.main(ActivityThread.java:5254)
[MonoDroid] at java.lang.reflect.Method.invoke(Native Method)
[MonoDroid] at java.lang.reflect.Method.invoke(Method.java:372)
[MonoDroid] at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
[MonoDroid] at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
[MonoDroid] Suppressed: java.lang.ClassNotFoundException: android.support.v7.appcompat.R$styleable
[MonoDroid] at java.lang.Class.classForName(Native Method)
[MonoDroid] at java.lang.BootClassLoader.findClass(ClassLoader.java:781)
[MonoDroid] at java.lang.BootClassLoader.loadClass(ClassLoader.java:841)
[MonoDroid] at java.lang.ClassLoader.loadClass(ClassLoader.java:504)
[MonoDroid] ... 19 more
[MonoDroid] Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack available
[MonoDroid] --- End of inner exception stack trace ---
[MonoDroid] at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () <0xa047bf80 + 0x0002b> in <filename unknown>:0
[MonoDroid] at Android.Runtime.JNIEnv.CallNonvirtualVoidMethod (IntPtr jobject, IntPtr jclass, IntPtr jmethod, Android.Runtime.JValue* parms) <0xa2007008 + 0x000b3> in <filename unknown>:0
[MonoDroid] at Android.App.Activity.OnCreate (Android.OS.Bundle savedInstanceState) <0xa1018918 + 0x0014f> in <filename unknown>:0
[MonoDroid] at ACS.FundRaising.Android.MvxActionBarEventSourceActivity.OnCreate (Android.OS.Bundle bundle) <0xa047b4e0 + 0x00037> in <filename unknown>:0
[MonoDroid] at ACS.FundRaising.Android.LoginActivity.OnCreate (Android.OS.Bundle bundle) <0xa047b278 + 0x0001b> in <filename unknown>:0
[MonoDroid] at Android.App.Activity.n_OnCreate_Landroid_os_Bundle_ (IntPtr jnienv, IntPtr native__this, IntPtr native_savedInstanceState) <0xa116f9b0 + 0x00057> in <filename unknown>:0
[MonoDroid] at (wrapper dynamic-method) System.Object:dd5e6f9d-f207-497c-b5c3-0a2c9dac76e7 (intptr,intptr,intptr)
[MonoDroid] --- End of managed exception stack trace ---
[MonoDroid] java.lang.NoClassDefFoundError: Failed resolution of: Landroid/support/v7/appcompat/R$styleable;
[MonoDroid] at android.support.v7.app.AppCompatDelegateImplBase.onCreate(AppCompatDelegateImplBase.java:118)
[MonoDroid] at android.support.v7.app.AppCompatDelegateImplV7.onCreate(AppCompatDelegateImplV7.java:146)
[MonoDroid] at android.support.v7.app.AppCompatActivity.onCreate(AppCompatActivity.java:59)
[MonoDroid] at md5da1044ae077a2d5a79e87e5c6bedf113.LoginActivity.n_onCreate(Native Method)
[MonoDroid] at md5da1044ae077a2d5a79e87e5c6bedf113.LoginActivity.onCreate(LoginActivity.java:31)
[MonoDroid] at android.app.Activity.performCreate(Activity.java:5990)
[MonoDroid] at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
[MonoDroid] at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2278)
[MonoDroid] at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387)
[MonoDroid] at android.app.ActivityThread.access$800(ActivityThread.java:151)
[MonoDroid] at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)
[MonoDroid] at android.os.Handler.dispatchMessage(Handler.java:102)
[MonoDroid] at android.os.Looper.loop(Looper.java:135)
[MonoDroid] at android.app.ActivityThread.main(ActivityThread.java:5254)
[MonoDroid] at java.lang.reflect.Method.invoke(Native Method)
[MonoDroid] at java.lang.reflect.Method.invoke(Method.java:372)
[MonoDroid] at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
[MonoDroid] at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
[MonoDroid] Caused by: java.lang.ClassNotFoundException: Didn't find class "android.support.v7.appcompat.R$styleable" on path: DexPathList[[zip file "/data/app/org.cancer.fundraising-1/base.apk"],nativeLibraryDirectories=[/data/app/org.cancer.fundraising-1/lib/x86, /vendor/lib, /system/lib]]
[MonoDroid] at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
[MonoDroid] at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
[MonoDroid] at java.lang.ClassLoader.loadClass(ClassLoader.java:469)
[MonoDroid] ... 18 more
[MonoDroid] Suppressed: java.lang.ClassNotFoundException: android.support.v7.appcompat.R$styleable
[MonoDroid] at java.lang.Class.classForName(Native Method)
[MonoDroid] at java.lang.BootClassLoader.findClass(ClassLoader.java:781)
[MonoDroid] at java.lang.BootClassLoader.loadClass(ClassLoader.java:841)
[MonoDroid] at java.lang.ClassLoader.loadClass(ClassLoader.java:504)
[MonoDroid] ... 19 more
[MonoDroid] Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack available
[Mono] Assembly Ref addref GoogleAnalytics.Core[0xb429abe0] -> System.Net.Http[0xaed233a0]: 3
[Mono] Assembly Ref addref GoogleAnalytics.Core[0xb429abe0] -> System.Core[0xb4387580]: 7
[Mono] Assembly Ref addref System.Net.Http[0xaed233a0] -> System[0xb4387760]: 10
[Mono] Assembly Ref addref System.Net.Http[0xaed233a0] -> System.Core[0xb4387580]: 8
[mono-rt] [ERROR] FATAL UNHANDLED EXCEPTION: Java.Lang.NoClassDefFoundError: Failed resolution of: Landroid/support/v7/appcompat/R$styleable; ---> Java.Lang.ClassNotFoundException: Didn't find class "android.support.v7.appcompat.R$styleable" on path: DexPathList[[zip file "/data/app/org.cancer.fundraising-1/base.apk"],nativeLibraryDirectories=[/data/app/org.cancer.fundraising-1/lib/x86, /vendor/lib, /system/lib]]
[mono-rt]
[mono-rt] --- End of managed exception stack trace ---
[mono-rt] java.lang.ClassNotFoundException: Didn't find class "android.support.v7.appcompat.R$styleable" on path: DexPathList[[zip file "/data/app/org.cancer.fundraising-1/base.apk"],nativeLibraryDirectories=[/data/app/org.cancer.fundraising-1/lib/x86, /vendor/lib, /system/lib]]
[mono-rt] at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
[mono-rt] at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
[mono-rt] at java.lang.ClassLoader.loadClass(ClassLoader.java:469)
[mono-rt] at android.support.v7.app.AppCompatDelegateImplBase.onCreate(AppCompatDelegateImplBase.java:118)
[mono-rt] at android.support.v7.app.AppCompatDelegateImplV7.onCreate(AppCompatDelegateImplV7.java:146)
[mono-rt] at android.support.v7.app.AppCompatActivity.onCreate(AppCompatActivity.java:59)
[mono-rt] at md5da1044ae077a2d5a79e87e5c6bedf113.LoginActivity.n_onCreate(Native Method)
[mono-rt] at md5da1044ae077a2d5a79e87e5c6bedf113.LoginActivity.onCreate(LoginActivity.java:31)
[mono-rt] at android.app.Activity.performCreate(Activity.java:5990)
[mono-rt] at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
[mono-rt] at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2278)
[mono-rt] at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387)
[mono-rt] at android.app.ActivityThread.access$800(ActivityThread.java:151)
[mono-rt] at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)
[mono-rt] at android.os.Handler.dispatchMessage(Handler.java:102)
[mono-rt] at android.os.Looper.loop(Looper.java:135)
[mono-rt] at android.app.ActivityThread.main(ActivityThread.java:5254)
[mono-rt] at java.lang.reflect.Method.invoke(Native Method)
[mono-rt] at java.lang.reflect.Method.invoke(Method.java:372)
[mono-rt] at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
[mono-rt] at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
[mono-rt] Suppressed: java.lang.ClassNotFoundException: android.support.v7.appcompat.R$styleable
[mono-rt] at java.lang.Class.classForName(Native Method)
[mono-rt] at java.lang.BootClassLoader.findClass(ClassLoader.java:781)
[mono-rt] at java.lang.BootClassLoader.loadClass(ClassLoader.java:841)
[mono-rt] at java.lang.ClassLoader.loadClass(ClassLoader.java:504)
[mono-rt] ... 19 more
[mono-rt] Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack available
[mono-rt]
[mono-rt] --- End of inner exception stack trace ---
[mono-rt] at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () <0xa047bf80 + 0x0002b> in <filename unknown>:0
[mono-rt] at Android.Runtime.JNIEnv.CallNonvirtualVoidMethod (IntPtr jobject, IntPtr jclass, IntPtr jmethod, Android.Runtime.JValue* parms) <0xa2007008 + 0x000b3> in <filename unknown>:0
[mono-rt] at Android.App.Activity.OnCreate (Android.OS.Bundle savedInstanceState) <0xa1018918 + 0x0014f> in <filename unknown>:0
[mono-rt] at ACS.FundRaising.Android.MvxActionBarEventSourceActivity.OnCreate (Android.OS.Bundle bundle) <0xa047b4e0 + 0x00037> in <filename unknown>:0
[mono-rt] at ACS.FundRaising.Android.LoginActivity.OnCreate (Android.OS.Bundle bundle) <0xa047b278 + 0x0001b> in <filename unknown>:0
[mono-rt] at Android.App.Activity.n_OnCreate_Landroid_os_Bundle_ (IntPtr jnienv, IntPtr native__this, IntPtr native_savedInstanceState) <0xa116f9b0 + 0x00057> in <filename unknown>:0
[mono-rt] at (wrapper dynamic-method) System.Object:dd5e6f9d-f207-497c-b5c3-0a2c9dac76e7 (intptr,intptr,intptr)
[mono-rt] --- End of managed exception stack trace ---
[mono-rt] java.lang.NoClassDefFoundError: Failed resolution of: Landroid/support/v7/appcompat/R$styleable;
[mono-rt] at android.support.v7.app.AppCompatDelegateImplBase.onCreate(AppCompatDelegateImplBase.java:118)
[mono-rt] at android.support.v7.app.AppCompatDelegateImplV7.onCreate(AppCompatDelegateImplV7.java:146)
[mono-rt] at android.support.v7.app.AppCompatActivity.onCreate(AppCompa
In my case a solution Clean was necessary to get it working.
This issue is resolved by Re-Cloning the repository. Still I don't know what caused the issue but I ended up wasting lot of time. I tried things like;
Removing and downloading packages
Deleting Obj/Bin
Deleting appcompat from android SDK install folder and re-downloading it
Using component instead of package
Probably build output generated some garbage resulting in such issue.

Resources