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I have dug out an old android project that I was working on a few years ago and loaded it into a new eclipse install (latest ADT etc). The project all compiles ok (after some minor tweaking), and the app starts fine, however, when i press a button to start the main activity i get the following stack trace: FATAL EXCEPTION: main java.lang.NoClassDefFoundError: com.tmm.android.activities.GameActivity at com.tmm.android.activities.StartActivity.onClick(StartActivity.java:53) at android.view.View.performClick(View.java:2408) Now the class in question (GameActivity) is one of my classes that is in the app, so I know thats not the problem - but I noticed a warning right at the top of the logcat: Unable to resolve superclass of Lcom/tmm/android/activities/GameActivity; (33) Link of class 'Lcom/tmm/android/activities/GameActivity;' failed My class GameActivity extends another class that is part of a third-party jar that i have included in the project (included it in the 'libs' directory, and added it to the project build path in eclipse). Can anyone advise what I might have done wrong, or anything that has changed in the ADT/etc that I might need to take account of (it was working fine when i last had it in Eclipse) Cheers

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