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I had been able to save ai files as PDF files (save as) - no problem. However it now occurs that any ai file that I try to save as a PDF file generates an errror message:
An unknown error is detected. To help us investigate -- .
Given this problem is not specific to one specific file don't know that sending a file would be helpful
Have tried resetting preferences.
Reset the Settings folder by renaming it.
Coworkers are able to open same illustrator files and save as PDF with no error message.
Using Illustrator on a PC.
Make sure you have a printer chosen, this really does affect making of PDFs, no joke. If your printer could be corrupt delete and make a new one.
You may need to reset preferences in Illustrator. Then close and reopen Illustrator.