Last week, we had the author of TDD for a Shopping Website LiveProject. Friday at 11am Ranch time, Steven Solomon will be hosting a live TDD session just for us. See for the agenda and registration link
Perhaps the serialized object file is not correct on the server. If you uploaded it via FTP, then perhaps you used text mode rather than image mode? Or perhaps the code is finding the wrong file (i.e., the file on the server is plain text, rather than the expect serialized object file).