As confirmed by the user on email, the issue is no longer reproducible.
An error occurred while saving the commentAnonymous commented
I have the same problem, downloaded the Indesign verison CC18 yesterday under MAc High SIerra
We have released an update for InDesign CC2019 (v 14.0.1) which contains fixes for some key issues. If you are not already on 14.0.1 (build 209), then we recommend you to update to latest version.
If you still face this issue even after updating, please send the following information to email@example.com :
Reproducible Steps –
• Error snapshot or video recording of the issue.
• Is the issue related to a specific document(s)/asset(s)? If yes, can you please share the document(s)/asset(s) with us? Please package the entire document(To package the document, Go to File → Package)
• Does trashing InDesign Preferences and Cache help resolve the issue? Please take a backup of the same before trashing them.
Adobe InDesign team