So when adding it to the SVN I screwed up the folder structure.
Updated on the site and hopefully in a few minutes the new/working version will be up. If you did download this when I had it wrong all you need to do is navigate to your wp-content/plugins folder, and then move the contents of twitpost/twitpost to twitpost
Eg was:
plugins/twitpost/twitpost/files
Now:
plugins/twitpost/files
Sorry about that, I'm new to SVN.