"Building your first app" run time errors with Eclipse-ADT - eclipse-adt

Question

I'm working on the "Building Your First App" under Android's app creation training. I have completed all the steps, and am running the app through my Galaxy S4. It loads the first page entirely where the user enters in whatever they like, and then takes you to the second page displaying what the user typed in. Loading the second page is where things go wrong.
02-07 16:21:06.167: W/dalvikvm(21946): threadid=1: thread exiting with uncaught exception (group=0x417a4898)
02-07 16:21:06.177: E/AndroidRuntime(21946): FATAL EXCEPTION: main
02-07 16:21:06.177: E/AndroidRuntime(21946): java.lang.IllegalStateException: Could not find a method sendmessage(View) in the activity class com.example.myfirstapp.MainActivity for onClick handler on view class android.widget.Button
02-07 16:21:06.177: E/AndroidRuntime(21946): at android.view.View$1.onClick(View.java:3825)
02-07 16:21:06.177: E/AndroidRuntime(21946): at android.view.View.performClick(View.java:4475)
02-07 16:21:06.177: E/AndroidRuntime(21946): at android.view.View$PerformClick.run(View.java:18786)
02-07 16:21:06.177: E/AndroidRuntime(21946): at android.os.Handler.handleCallback(Handler.java:730)
02-07 16:21:06.177: E/AndroidRuntime(21946): at android.os.Handler.dispatchMessage(Handler.java:92)
02-07 16:21:06.177: E/AndroidRuntime(21946): at android.os.Looper.loop(Looper.java:137)
02-07 16:21:06.177: E/AndroidRuntime(21946): at android.app.ActivityThread.main(ActivityThread.java:5419)
02-07 16:21:06.177: E/AndroidRuntime(21946): at java.lang.reflect.Method.invokeNative(Native Method)
02-07 16:21:06.177: E/AndroidRuntime(21946): at java.lang.reflect.Method.invoke(Method.java:525)
02-07 16:21:06.177: E/AndroidRuntime(21946): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1187)
02-07 16:21:06.177: E/AndroidRuntime(21946): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1003)
02-07 16:21:06.177: E/AndroidRuntime(21946): at dalvik.system.NativeStart.main(Native Method)
02-07 16:21:06.177: E/AndroidRuntime(21946): Caused by: java.lang.NoSuchMethodException: sendmessage [class android.view.View]
02-07 16:21:06.177: E/AndroidRuntime(21946): at java.lang.Class.getConstructorOrMethod(Class.java:423)
02-07 16:21:06.177: E/AndroidRuntime(21946): at java.lang.Class.getMethod(Class.java:787)
02-07 16:21:06.177: E/AndroidRuntime(21946): at android.view.View$1.onClick(View.java:3818)
02-07 16:21:06.177: E/AndroidRuntime(21946): ... 11 more
I'm a little overwhelmed on where to even start alleviating this problem..
active_display_message.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context=".DisplayMessageActivity" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/hello_world" />
This is the onCreate() under the DisplayMessageActivity class:
#SuppressLint("NewApi")
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//Get the message from the intent
Intent intent = getIntent();
String message = intent.getStringExtra(MainActivity.EXTRA_MESSAGE);
//Create the text view
TextView textView = new TextView(this);
textView.setTextSize(40);
textView.setText(message);
//set the text view as the activity layout
setContentView(textView);
setContentView(R.layout.activity_display_message);
// Make sure we're running on Honeycomb or higher to use ActionBar APIs
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB){
// Show the Up button in the action bar.
getActionBar().setDisplayHomeAsUpEnabled(true);
}
}