The operation cannot complete because of an unknown error. [xlfd]
I have two customers that send me hundreds of Illustrator files created using a Windows version of Illustrator. Every one of them reports this issue on opening: "The operation cannot complete because of an unknown error. [xlfd]." I click OK and everything is fine in the document as far as I can tell. The problem is that I need to batch save these files as PDFs, but I have to sit there and click "OK" for every file so defeating the purpose of batch processing. This is a recurrent bug with the last three revisions of Illustrator. Please resolve it.
Please get in touch with us at any of the other support channels – https://helpx.adobe.com/support.html . Since this is not a generic issue that we can reproduce at our end, we will need someone to look into your machine to figure out what is going on here.
Warm Regards,
Ashutosh Chaturvedi | Sr. Quality Engineering Manager – Illustrator
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Athanasios Karalias commented
The explanation is here and has to do with fonts and how Unix handles them.
XLFD = X Logical Font Description.
https://books.google.gr/books?id=qrElYgVLDwYC&pg=PA222&lpg=PA222&dq=operation+cannot+complete+xlfd+error&source=bl&ots=4juAkW3_KL&sig=ACfU3U1ulKFtfNVkdO6v0unld7lb7WGAPA&hl=en&sa=X#v=onepage&q=operation%20cannot%20complete%20xlfd%20error&f=falseAnd although the description might be wrong or unrecognizable, most of the times it;s not a real problem and has no other impact on the document.