sketch will not upload to Due using WEB editor

Total newbie here. I'm using DUE R3 boards made in Italy. I'm using a Windows machine running Windows 10. In the past I could upload my sketches to my Due board(s) with no problem using the online editor. About 2 weeks ago the uploads began showing errors intermittently using the online editor with CHROME and EDGE browsers. Of the two browsers Edge had the fewest failures.

Now, the upload fails every time regardless of the browser. I get the error message: "Executing command: exec: not started". The suggestion window says to try "bossac-h"or "bossac--help". I searched on bossac and found that this has been a problem with the servers off and on.

Any help or suggestions would be greatly appreciated.

Please do this:

  • Attempt an upload.
  • Wait for the upload to fail.
  • Hover the mouse over the red bar at the bottomof the Arduino Web Editor that shows the error message. Click and drag it up so you can see the black console window.
  • Click the icon in the top right corner of the console that looks like two pieces of paper.
  • In a forum reply here, click on the reply field.
  • Click the </> button on the forum toolbar. This will add the forum’s code tags markup to your reply.
  • Press “Ctrl + V”. This will paste the upload output between the code tags.
  • Move the cursor outside of the code tags before you add any additional text to your reply.

If the length of the output exceeds the forum’s 9000 character limit, save it in a .txt file and post it here as an attachment. If you click the “Reply” button you’ll see the “Attachments and other options” link.