We have released InDesign 2020.0.1 with a lot of stability fixes. We recommend you to upgrade to latest version (if you’re not already on it) as it is more robust.
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• Reproducible Steps – What were you doing when InDesign issue occurred?
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Adobe InDesign Team
An error occurred while saving the commentAnonymous commented
CC2017 IDML files not compatible with CS6 or the CS6 update. I too am receiving the same message trying to open an IDML file in CS6 v8.1 (Windows 7) that was created in CC2017 with downsaved selection to IDML (using Mac). Which plugin? No other application is open. I updated CS6 to the latest. We're literally stuck.