I'm not sure what to say, except I've never seen the error whilst development, nor heard of anyone else having the problem with ExifMeta v3. I'm not saying it isn't possible, only saying I've never seen / heard of it.
If its not a drive space issue on C, then the root of the cause may be a different disk error - check out this forum about it (solution is near the bottom):
http://feedback.photoshop.com/photoshop_family/topics/incorrect_error_message