How can I recover a file that displays the error: Illegal Operand; Offending operator: ,

My file was closed without a problem and saved correctly. When opening I get the message: Illegal operand, Offending operator: , What can I do to repair this file? I created the file using Illustrator CC2014 with the plugin MAPublisher on an iMac, running under OSX 10.10.2, Yosemite. The file represents a map and consists of many layers. I am very keen to learn what may have caused this problem to occur and how to circumvent it. Andre.

Andre,
For possible reasons, see below.
One thing often tried first is to create a new document and File>Place the (PDF contents, if any, of the) corrupted one to see how much may be rescued that way.
Here are some websites where you can see whether it can rescue the actual file, and if it can, you may pay for a subscription to have it done,
http://www.recoverytoolbox.com/buy_illustrator.html
http://markzware.com/adobe-software/fix-illustrator-file-unknown-error-occurred-pdf2dtp-fi le-recovery/
http://www.illustrator.fixtoolbox.com/
As far as I remember, the first one is for Win and the second one is for Mac, while the third one should be for both.
Here are a few pages about struggling with it yourself:
http://daxxter.wordpress.com/2009/04/16/how-to-recover-a-corrupted-illustrator-ai-file/
http://helpx.adobe.com/illustrator/kb/troubleshoot-damaged-illustrator-files.html
http://kb2.adobe.com/cps/500/cpsid_50032.html
http://kb2.adobe.com/cps/500/cpsid_50031.html
http://helpx.adobe.com/illustrator/kb/enable-content-recovery-mode-illustrator.html
External media: It is always recommended here to open/save from/to own hard disk, and to copy from/to networks and removable media. You may be lucky (for a while), but the chances of file corruption and other unpleasantnesses are immensely greater when you use anything but the harddisk, and it is better to be safe than sorry.
In addition to the (far greater) risk of file corruption, some issues are mentioned here:
http://helpx.adobe.com/illustrator/kb/illustrator-support-networks-removable-media.html
To have a network actually work may require some work.
If you transfer by external means it is always safest to zip/compress the file to avoid corruption.

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How can I recover a file that displays the error: Illegal Operand; Offending operator: ,

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