App Force Closes Before Even Opening?

I'm working on this new app, and it's force closing before it even opens, why it's force closing? (I've tried this app on my samsung transform and my motorola xoom yesterday, both worked, and them i added the image button inplace of the regular button, and now it won't work. here are my files;

Main.xml

Code:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="horizontal" >
<EditText
android:id="@+id/editText1"

[code]...