Illustrator error "An unknown error has occurred"

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Hi,

I am working in an .ai file that I have saved frequently before. Suddenly when I try to save the file, I get an error that reads "an unknown error has occurred" and the file won't save at all, anywhere. I have not seen this error message before and have had no issues opening or saving the file up until this point.

Any idea?

Please help.

Thanks!

I didn't find the right solution from the Internet.

References forums.adobe.com/thread/2235012

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