Adobe Illustrator Operation Cannot Complete Because Of An Unknown Error Parm [better] May 2026

The "The operation cannot complete because of an unknown error (PARM)" is a notorious, long-standing bug in Adobe Illustrator that typically strikes when you try to save files, use the Image Trace tool, or modify text boxes

If the error only happens in one specific document, the problem is likely an "ambiguous" object or a complex appearance attribute. The "The operation cannot complete because of an

Reset Preferences

: This is the most common solution. Hold Alt + Control + Shift (Windows) or Option + Command + Shift (macOS) while launching Illustrator to restore default settings. Note that this will remove your custom settings. use the Image Trace tool