This could be an issue with ADB . Check the version of ADB in your system and in your friends.

And if you are using the android studios run command to launch the app on device, try once with ADB explicitly. Let's assume your app's package name is "com.example.myapp" and the main activity is "com.example.myapp.MainActivity". The command to launch the app would be: adb shell am start -n com.example.myapp/.MainActivity