Adobe Illustrator Operation Cannot Complete Because Of An Unknown Error Parm -

: Check for text boxes with a red "+" icon (overflow text). Expanding the box or deleting the hidden text often clears the error Permanent Solutions 1. Reset Illustrator Preferences

Adobe stores GPU shader caches that can become corrupted. : Check for text boxes with a red "+" icon (overflow text)

Close Illustrator. Hold down Alt + Ctrl + Shift (Windows) or Option + Command + Shift (macOS) while relaunching the app. Click "Yes" when asked to delete settings . : Check for text boxes with a red "+" icon (overflow text)

Diagnostic approach (systematic, stepwise) : Check for text boxes with a red "+" icon (overflow text)

Some users found that resetting complex path strokes back to "Basic" resolved the issue .