Rev
Try re-typing the whole file name. If you look at your earlier post, when you cut and pasted the error statement, there is a question mark there. When I look at my file, I notice the apostrophe is different than normal. I'd suggest re-typing it or just edit out the apostrophe altogether. With other torrents, the differnece between European and American keyboards has created this problem because the conversion program does not recognize the different symbol.
Well... I don't have a problem at all anyway so it doesn't matter for me :P