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Do three things before you do anything else. First, in Finder or Explorer make a copy of the file for backup. Second, export the file to .inx in CS4 or earlier, or .idml in CS5 or later. Third, do a Save AS to a new file name. OK a fourth thing, but it's not so time critical, Open the .inx/.idml and do a Save As to yet another file name.
See if either of the new files continues to generate the error. If not, that's the file to use. If they both generate an error, try moving the pages from the problem file into a new file, save with a new name, and test that. If that still fails, go page by page and Copy/Paste In Place on pages in a new file and test again.
thanks for the reply. Ive done all those things, when i do, the error might not appear for the first few saves with the new file but then it appears and i can't save to the server again. As i'm working continually on 300 odd page catalogues i can't afford to always make a new file.
It won't even let me do a 'save as' to a different name.
Make sure you have installed the latest patch for ID.
I've had that message when trying to save but lost connection to server where the file was originally saved. On Illustrator it looks like a lag plus when I click on anything - whole AI window fades with white (I'm on Windows). I guess there are short intervals when connection is lost and then software gives these error messages or gets frozen. I can just wait until connection comes back again or - sometimes I can do that - save just locally on C and copy the file later to the server.