ClassCastException on Android 2.1

[dchristl]

Hello,

some users with older devices reported me a strange error, causing my app not to start. This error only occurs on Android 2.1 devices (exactly MotoMB511; Android 2.1-update1).

The full stacktrace is:

java.lang.RuntimeException: Unable to start activity ComponentInfo{de.christl.smsoip/de.christl.smsoip.activities.SendActivity}: java.lang.ClassCastException: android.widget.FrameLayout
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2558)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2574)
        at android.app.ActivityThread.access$2400(ActivityThread.java:121)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1925)
        at android.os.Handler.dispatchMessage(Handler.java:99)
        at android.os.Looper.loop(Looper.java:136)
        at android.app.ActivityThread.main(ActivityThread.java:4425)
        at java.lang.reflect.Method.invokeNative(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:521)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
        at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.ClassCastException: android.widget.FrameLayout
        at com.actionbarsherlock.internal.ActionBarSherlockCompat.installDecor(ActionBarSherlockCompat.java:924)
        at com.actionbarsherlock.internal.ActionBarSherlockCompat.setContentView(ActionBarSherlockCompat.java:849)
        at com.actionbarsherlock.app.SherlockFragmentActivity.setContentView(SherlockFragmentActivity.java:262)
        at de.christl.smsoip.activities.SendActivity.onCreate(SendActivity.java:196)
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2521)
        ... 11 more
java.lang.ClassCastException: android.widget.FrameLayout
        at com.actionbarsherlock.internal.ActionBarSherlockCompat.installDecor(ActionBarSherlockCompat.java:924)
        at com.actionbarsherlock.internal.ActionBarSherlockCompat.setContentView(ActionBarSherlockCompat.java:849)
        at com.actionbarsherlock.app.SherlockFragmentActivity.setContentView(SherlockFragmentActivity.java:262)
        at de.christl.smsoip.activities.SendActivity.onCreate(SendActivity.java:196)
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2521)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2574)
        at android.app.ActivityThread.access$2400(ActivityThread.java:121)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1925)
        at android.os.Handler.dispatchMessage(Handler.java:99)
        at android.os.Looper.loop(Looper.java:136)
        at android.app.ActivityThread.main(ActivityThread.java:4425)
        at java.lang.reflect.Method.invokeNative(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:521)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
        at dalvik.system.NativeStart.main(Native Method)

I just use the ActionBar with no special behaviour. Is there anything I can do?

Thanks in advance, Danny