Launcher won't update my mod (error 8)

CommadnerWar

I am trying to upload an update of my mod,but when it's uploading, after some seconds it pops up an error "failed to update mod in workshop! (error code: 8)".

This error appeard first at my Attila launcher 1 year ago and it still not fixed and now to my rome 2 launcher.

I've tried to run it as admin,verify integrity,reinstall,updating steam,redownload the previous version and tried to update it,changing my download region and remaking the preferences.txt again.
My drivers are up to date.
I cannot find nothing else.