Fix for this issue is now available in the latest update of InDesign 2020 – that is, InDesign 15.1.2
In the Creative Cloud Desktop application, click on the Updates section on the left. You should be able to see the Update available for InDesign. Please update your InDesign application to this version to try out the fix.
Let us know in the comments section if you still face this problem.
Adobe InDesign Team
An error occurred while saving the commentGwen commented
I agree, I've been having this issue endlessly for the last few weeks. Windows 10, all updates installed. Local machine not server based. Cleared preferences, uninstalled and reinstalled... keeps happening. Please help!