The next time Illustrator dares to tell you it "cannot complete an operation because of an unknown error," you’ll know exactly where to look. Stay calm, follow the steps, and you’ll be back to designing in no time.
~/Library/Preferences/Adobe Illustrator [version] Settings . 2. Troubleshoot Content-Specific Issues The next time Illustrator dares to tell you
Adobe stores GPU shader caches that can become corrupted. follow the steps
She re-saved as a new .ai file. This time, the save bar completed. try saving as an Illustrator EPS
: If the error is file-specific, copy all elements and paste them into a brand-new Illustrator file to bypass hidden metadata errors. The "EPS" Trick : If you cannot save as an file, try saving as an Illustrator EPS