72 votes91 comments · Illustrator (Desktop) Bugs » File Save, Import and Export · Flag idea as inappropriate… · Admin →Completed (Comments Open) · AdminIllustrator Engineering (Software Engineer, Adobe Illustrator) responded
We have the fix available in the latest release. Please update Illustrator using Adobe Creative Cloud application to the latest build for version Illustrator CC 24.0.0
For the issue where you are encountering “An unknown error has occurred” while saving the document then please go to the following link to track the status of this issue:
An error occurred while saving the commentMatt commented
I'm having the same problem.