Exactly! This information gives us a better idea of the conditions under which the upload failed, but unfortunately there are still multiple possible causes (even though far less than for "exit status 1") of this error output so we will need to perform additional procedures in order to try to find the specific cause.
Please try this experiment and then report back with the results:
This procedure is not intended to solve the problem. The purpose is to gather more information.
- Connect the Arduino board to your computer with a USB cable.
- Press and release the button on the Arduino board that is marked "RESET".
Now please reply here on the forum thread with the answer to the following question:
- Did you see the "L" LED blink multiple times quickly immediately after you released the "RESET" button?