Hi Matt,
Do you have any other plugins installed that have functionality for interfacing with Amazon AWS services? If so, try de-activating them, and seeing if that makes a difference.
Failing that, you'll need to find your PHP error log (ask the web hosting company if you're not sure where to find it) - there's likely to be something logged in there. It looks like UD crashes at a certain stage each time - which suggests there's another plugin that's interfering, but seeing the actual logged error will help get a definitive answer.
David