Deployment Error Message using Voltserver

Currently using version 8.5.7.4 - get the following message in the logfile

2022-09-15 18:46:07,933 - IDEController - INFO - deploy_location()
2022-09-15 18:46:07,933 - IDEController - INFO - volt
2022-09-15 19:16:34,194 - IDEController - INFO - deploy_location()
2022-09-15 19:16:34,194 - IDEController - INFO - volt
2022-09-15 19:16:34,196 - MainFrame - INFO - OnMenuRunDeployMenu
2022-09-15 19:16:38,763 - IDEController - INFO - localpath
2022-09-15 19:16:38,763 - IDEController - INFO - deployPath C:\Users\PC\AppData\Local\Temp\tmpu2qhnnyp
2022-09-15 19:17:33,050 - MainFrame - WARNING - UnknownError (500): Could not upload new app version.

Also message on screen see attached.

Any ideas.
Deployment Message

Can you email a copy of your AppStudio About screen directly to me? There may be a problem with your account.

Even though this message appears, it still uploads the latest version of app…. Strange.

Very strange - so it’s working correctly despite the error message?

I have exactly the same issue. Same error but it successfully uploads