Android Studio - Gradle Errors NoClassDefFound when including libraries - gradle

Question

This has been happening too often and I am not sure about the reason. Would really love to know the reason behind it.
My app's gradle looks like this
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
compile project(':Q-municate_core')
compile "info.hoang8f:fbutton:${rootProject.FButtonVersion}"
compile "com.google.android.gms:play-services:${rootProject.googlePlayServicesVersion}"
compile "com.soundcloud.android:android-crop:${rootProject.cropperVersion}#aar"
compile group: 'com.squareup.picasso', name: 'picasso', version: "${rootProject.picassoVersion}"
compile "com.google.guava:guava:${rootProject.guavaVersion}"
compile "com.makeramen:roundedimageview-apklib:${rootProject.roundedImageViewVersion}"
compile "se.emilsjolander:stickylistheaders:${rootProject.stickyListHeadersVersion}"
compile ('de.keyboardsurfer.android.widget:crouton:1.8.4#aar'){
exclude group: 'com.google.android', module: 'support-v4'
}
compile 'com.nineoldandroids:library:2.4.0'
compile 'com.daimajia.easing:library:1.0.1#aar'
compile 'com.daimajia.androidanimations:library:1.1.3#aar'
compile ('it.sephiroth.android.library:pagerslidingtabstrip:1.1.1'){
exclude group: 'com.google.android', module: 'support-v4'
exclude group: 'com.google.android', module: 'support-v7'
}
}
This builds well, but my app crashes with " java.lang.NoClassDefFoundError: com.mface.mcall.utils.Consts"and its on a completely different class. I have not even used the library that I have included. Just the "compile" statement in the app gradle and the app starts crashing.
For example this:
607-5607/mcall.mface.com.mcallandroidstudio E/AndroidRuntime﹕ FATAL EXCEPTION: main
java.lang.NoClassDefFoundError: com.mface.mcall.utils.Consts
at com.mface.mcall.utils.ImageUtils.getImageLoaderConfiguration(ImageUtils.java:60)
at com.mface.mcall.App.initImageLoader(App.java:32)
at com.mface.mcall.App.initApplication(App.java:42)
at com.mface.mcall.App.onCreate(App.java:27)
at android.app.Instrumentation.callApplicationOnCreate(Instrumentation.java:1070)
at com.lbe.security.service.core.client.b.x.callApplicationOnCreate(Unknown Source)
at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4708)
at android.app.ActivityThread.access$1300(ActivityThread.java:173)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1452)
at android.os.Handler.dispatchMessage(Handler.java:107)
at android.os.Looper.loop(Looper.java:194)
at android.app.ActivityThread.main(ActivityThread.java:5469)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:525)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:857)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:624)
at dalvik.system.NativeStart.main(Native Method)
If I remove the following lines all is well. I have no idea why; its good to know the reason so i can work around it. This has been happening often with different libraries for example aviary.
compile ('it.sephiroth.android.library:pagerslidingtabstrip:1.1.1'){
exclude group: 'com.google.android', module: 'support-v4'
exclude group: 'com.google.android', module: 'support-v7'
}
I have tried the following combinations too
compile 'it.sephiroth.android.library:pagerslidingtabstrip:1.1.1'
compile ('it.sephiroth.android.library:pagerslidingtabstrip:1.1.1'){
exclude group: 'com.google.android', module: 'support-v4'
}
There are no gradle errors but the app crashes.
May be am missing something here?
The full app gradle
apply plugin: 'com.android.application'
repositories {
jcenter()
}
android {
compileSdkVersion 21
buildToolsVersion "21.1.2"
defaultConfig {
applicationId "mcall.mface.com.mcallandroidstudio"
minSdkVersion 15
targetSdkVersion 21
versionCode 1
versionName "1.0"
multiDexEnabled true
}
buildTypes {
release {
minifyEnabled true
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
debuggable false
signingConfig signingConfigs.debug
zipAlignEnabled true
}
dexOptions{
// jumboMode = true
preDexLibraries = false
incremental true
javaMaxHeapSize "4g"
}
}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
//compile 'com.android.support:appcompat-v7:21.0.3'
compile project(':Q-municate_core')
compile "info.hoang8f:fbutton:${rootProject.FButtonVersion}"
compile "com.google.android.gms:play-services:${rootProject.googlePlayServicesVersion}"
compile "com.soundcloud.android:android-crop:${rootProject.cropperVersion}#aar"
compile "com.nostra13.universalimageloader:universal-image-loader:${rootProject.universalImageLoaderVersion}"
compile group: 'com.squareup.picasso', name: 'picasso', version: "${rootProject.picassoVersion}"
compile "com.google.guava:guava:${rootProject.guavaVersion}"
compile "com.makeramen:roundedimageview-apklib:${rootProject.roundedImageViewVersion}"
compile "se.emilsjolander:stickylistheaders:${rootProject.stickyListHeadersVersion}"
compile ('de.keyboardsurfer.android.widget:crouton:1.8.4#aar'){
exclude group: 'com.google.android', module: 'support-v4'
}
compile 'com.nineoldandroids:library:2.4.0'
compile 'com.daimajia.easing:library:1.0.1#aar'
compile 'com.daimajia.androidanimations:library:1.1.3#aar'
compile ('it.sephiroth.android.library:pagerslidingtabstrip:1.1.1'){
exclude group: 'com.google.android', module: 'support-v4'
exclude group: 'com.google.android', module: 'support-v7'
}
}