iMovie Won't export video! "Could not complete share action 'file'." error

I'm on a 13 inch MacBook Pro mid 2010 edition computer running the most recent version of Mavericks. I'm also running the most recent version of iMovie (both as of initial post date). I've finished editing my video for my youtube channel, and when I click share, then file, it runs the process for a few seconds, then gives the error, "Could not complete share action 'file'." When I click more info all I get is the message "file could not be created." I need to find a solution ASAP, I've been looking for hours with no results. Please help if you've had something work for you, thanks!