Unable To Instantiate Application - Classnotfoundexception On Mainactivity

I've tried cleaning my project several times, restarting Eclipse, going to Build path -> Export, making sure Android private libraries is ticked, and I've tried parsing through

Solution 1:

try this:

 <application
    android:allowBackup="true"
    android:icon="@drawable/brock_logo"
    android:label="@string/app_name"
    android:logo="@drawable/brock_logo"
    android:theme="@style/AppTheme" >

then clean and rebuild your project.

Solution 2:

I guess you actually SHOULD tick use android private libraries. also I was having same problem because of using wrong appcompat library. Make sure everything is OK with it.