This problem has been bugging me for ages and I can\'t seem to fix it or fully localize the source of the problem (although at times I can force it by allowing the phone to Stan
This is because of over stack/stack overflow.
1. Switch off and Switch on your Android Device
2. Restart your ADB server(adb -kill server and adb -start sever)
3. Check the mounted SD card and check the USB debug ON