Outdated drivers are infamous for generating generic "unknown" errors.
After updating, restart and perform a clean Illustrator launch.
If you saved the file as an Adobe Cloud Document (prior to the PARM error):
At 1:34 AM, Maya called Leo, a former coworker who now did forensic debugging for print shops. After updating, restart and perform a clean Illustrator
“Leo. What’s ‘parm’?”
He was silent for a moment. “Where’d you see that?”
“Illustrator error. It says ‘unknown error parm.’ The file won’t save, won’t export, won’t do anything.” If you saved the file as an Adobe
Leo exhaled. “Okay. Don’t panic. That error started showing up six months ago. It’s not a bug in your file. It’s a bug in how Illustrator handles a specific kind of malformed metadata. Usually happens if you’ve ever used a third-party plug-in that writes custom parameters—‘parm’ is short for ‘parameter.’ But Illustrator doesn’t know how to close the read loop. So it just… hangs.”
“How do I fix it?”
“You have to strip the metadata without opening the file normally. Use a script. You on Mac?” At 1:34 AM
“Yes.”
“Open Terminal. Use pdf2svg to convert the PDF-compatible stream to SVG, then re-import. You’ll lose editability of live effects, but you’ll save the art.”
Before we dive into registry edits or terminal commands, let’s start with the simplest fixes. These solve the PARM error in roughly 40% of cases.