InteractiveStory has stopped

I run my interactive story and it stops after I click on the button to begin. Here is my error dump... the only difference I see in my code from the presented code was that the Activity extend ActionBarActivity and not Activity. Any idea what may be causing this?

--------- beginning of crash 07-12 23:58:29.594 8211-8211/com.gregvestal.interactivestory E/AndroidRuntime﹕ FATAL EXCEPTION: main Process: com.gregvestal.interactivestory, PID: 8211 java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.gregvestal.interactivestory/com.gregvestal.interactivestory.ui.MainActivity}: java.lang.ClassNotFoundException: Didn't find class "com.gregvestal.interactivestory.ui.MainActivity" on path: DexPathList[[zip file "/data/app/com.gregvestal.interactivestory-2/base.apk"],nativeLibraryDirectories=[/vendor/lib, /system/lib]] at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2209) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360) at android.app.ActivityThread.access$800(ActivityThread.java:144) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:135) at android.app.ActivityThread.main(ActivityThread.java:5221) 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:899) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694) Caused by: java.lang.ClassNotFoundException: Didn't find class "com.gregvestal.interactivestory.ui.MainActivity" on path: DexPathList[[zip file "/data/app/com.gregvestal.interactivestory-2/base.apk"],nativeLibraryDirectories=[/vendor/lib, /system/lib]] at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56) at java.lang.ClassLoader.loadClass(ClassLoader.java:511) at java.lang.ClassLoader.loadClass(ClassLoader.java:469) at android.app.Instrumentation.newActivity(Instrumentation.java:1065) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2199)             at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)             at android.app.ActivityThread.access$800(ActivityThread.java:144)             at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)             at android.os.Handler.dispatchMessage(Handler.java:102)             at android.os.Looper.loop(Looper.java:135)             at android.app.ActivityThread.main(ActivityThread.java:5221)             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:899)             at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694) Suppressed: java.lang.ClassNotFoundException: com.gregvestal.interactivestory.ui.MainActivity at java.lang.Class.classForName(Native Method) at java.lang.BootClassLoader.findClass(ClassLoader.java:781) at java.lang.BootClassLoader.loadClass(ClassLoader.java:841) at java.lang.ClassLoader.loadClass(ClassLoader.java:504) ... 13 more Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack available