Exception During Import Powerpoint

I attached the error I received when trying to import a power point.  It was save on my desktop and i was able to import a different power point with no issues.  I saved a couple of slides as a separate presentation and was able to import those but when I tried to import the next 3 slides it didn't work.  It looks like this has been brought up a couple of time in the forum, but I couldn't find a solution.  A customer created the powerpoint, so I need to use their content, rather than create a new story file.