Unknown error while trying to save

Hi,

I noticed a human error in a feature in one of my drawings, so I opened the part, corrected it and tried to save it.  After I clicked "save" an error window came up (please see attached .jpeg).  The part did not save.  The same error comes up when I try to re-save the part under a different name, and I can't save it to the desktop either.  Does anyone know how to fix this?

Thanks,

Brian

SolidworksParts And Features