06-26 05:07:17.890: E/AndroidRuntime(3231): FATAL EXCEPTION: main 06-26 05:07:17.890: E/AndroidRuntime(3231): Process: com.sample.calendar, PID: 3231 06-26 05:07:17.
I think this happens when you run the app from eclipse while you already have the previous version installed ? This won't happen if you uninstall the app before running it again from eclipse. Also, this won't cause any problems.