The fix for this issue is available in the latest update of InDesign version 15.0.3
Please update your InDesign application to this version to get the fix.
Adobe InDesign team
An error occurred while saving the commentsamantha suter commented
Still having this issue. I cannot package a file, so now I cannot send my work to the client and I'm going to miss my deadline. Extremely frustrating! Help! Any workarounds?