I got "error=-36" while downloading a movie, and now I can't get it to resume

I got the error 36 while downloading a movie that I purchased. However, I had to pause it as I was downloading another movie and wanted that one to download a little quicker. Initially, I got error-50 and so I followed the instructions from that feed such as go to Itunes>preferences>restore cache and then restarted my computer (macbook pro) and restarted itunes. Now, I get error-36 and the movie still won't download. According to my account in the itunes store, it's already downloaded. I looked in Music>Itunes Library>Movies and it's not even there....so now what do I do???

Thanks for any help