550 Can't check for file existence

I read what this was, but don't understand what i can do to fix the issue?
It is only doing it on some of the files uploading. Does it ever have anything to do with the actual size of the upload file being too large?
flac upload to lma, is when this occurs

thanks

Hello ..

You can ignore this message. It's not considered an error.

Regard,s
Mat