I am confused ... In my application i set the target to be 2.1 and minimum sdk version is 4. I thought my application will run on all devices from 1.6 to 2.1 .... I have tested it on HTC magic running Android 1.6 and it is running fine. My client is testing it on Droid Eris running Android 2.0 but the application isn't working there. What must be the problem? Please help. Its urgent.