Did you manipulate the XML of this particular presentation with code? Open XML is very unforgiving and even tiny mistakes will give that error message.
You should also consider that it's just a corrupt file though complex tables can cause errors.
You may have to restore the file back. For this purpose you can use PowerPoint Recovery Toolbox. You will be able to recover the file. Since it happened only with this file, I would assume that the problem is not in the program or server.
http://www.oemailrecovery.com/powerpoint_recovery.html