If the error disappears, you have a plug-in conflict. Re-enable plug-ins one by one (in the Illustrator Plug-ins folder) to find the offender.
Here’s a concise review and troubleshooting guide for the error, based on common user experiences and technical analyses.
Work through these solutions sequentially, starting with the quickest fixes. 1. Reset Adobe Illustrator Preferences If the error disappears, you have a plug-in conflict
The error may occur when a script or a complex operation (like resizing large text boxes) tries to access more memory than is currently allocated to the software's scripting layer.
Close all Adobe applications. Go to C:\Windows\System32 and delete the FNTCACHE.DAT file. Restart your PC to allow Windows to rebuild a clean font cache. 5. Change or Optimize Scratch Disks Work through these solutions sequentially, starting with the
Based on user reports and Adobe support forums, the following are some possible causes of the "Operation cannot complete because of an unknown error" in Adobe Illustrator:
Make sure your operating system and Illustrator are up-to-date: Close all Adobe applications
Locate your Plug-ins folder (typically found in the main Adobe Illustrator installation directory).
How to Fix "The operation cannot complete because of an unknown error [PARM]" in Adobe Illustrator
: If Illustrator is unresponsive, use Cmd+Opt+Esc (Mac) or Ctrl+Alt+Delete (Windows) to force quit the application, then restart both the app and your computer.