If you were previously able to upload a program to the same Arduino you may solve the problem by disconnecting and reconnecting the Arduino, by closing and restarting the Arduino IDE or by shutting down and restarting your PC.
...R
If you were previously able to upload a program to the same Arduino you may solve the problem by disconnecting and reconnecting the Arduino, by closing and restarting the Arduino IDE or by shutting down and restarting your PC.
...R