Hi to All, I am new to android application development . Just I created in flex mobile android application with new certificate created . I installed the apk file through adb install and the Runtime apk. I can find the application in the emulator. When I executed . it crashed with the message unknown exception. I went through the logcat file. it shows some thing wrong with manifest file. I went through the manifest file it included in flex. There is no activity mentioned. Is it the problem . How to create the proper manifest file in flex - flashbuilder 4.5 to include the activity. Please help me.