I updated to SDK r20.0.1 a few days ago and since then my application fails to launch on an emulator or handset. I get 'unable to instantiate launch activity (class not found) error' - it seems the main activity is not in the APK. However there is no sign of any bug in Eclipse. My code worked fine before the update, and continues to work fine on another machine with an older SDK. The manifest and R,java etc all tie up. I'm developing for API 8 by the way - it is a game so it uses a simple stub as the activity that sets up an update thread for the main class and a Frame Layout. I have uninstalled the SDK and re-loaded it and simple 'Hello World' applications will work. Anyone any ideas - I'm completely out?
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