Am trying to find a solution for this issue as I am getting the same error over and over again this morning. I have restarted my computer several times, am always working on my local C drive, and every time I go to sync my animations this error pops up and PowerPoint shows my course as a recovered file.
It happens right after I preview a slide to see it, then go back to sync animations. I attached a copy of the error message.
I am working on a very tight deadline and am hoping you have a solution. If not I will have to consider moving my content into another software, which really isn't an option at this time.