Android USB Debugging 실패

com.android.ddmlib.AdbCommandRejectedException: device unauthorized. 
This adb server's $ADB_VENDOR_KEYS is not set 
Try 'adb kill-server' if that seems wrong. 
Otherwise check for a confirmation dialog on your device. 
Error while Installing APK 

Android USB Debugging Failed

 

 

Android 기기로 디버깅 푸쉬과정 실패시 

기기에서 usb 다시 플러그해주고 

'항상허용' 해주면 끝