this is my error in console :
11-29 19:06:50.295: E/AndroidRuntime(333): android.database.sqlite.SQLiteException: table usuarios has no column named email: ,
Check if you have any syntax errors. If no syntax errors found just uninstall and reinstall the app. After which everything should work fine.
P.S. My thoughts: This uninstalling and reinstalling is really annoying. Developers spent so much time finding the bug but at the end the solution turns out to be uninstall and reinstall. This also happens if you add permissions(e.g. Internet Access permission) to your app. This database thing is second such thing i m finding. Android Team at Google should do something about this.