If you downloaded the Prat addon update I posted earlier today on the site at around 3pm EST, please re-download the prior version from the same location. It appears there is a coding error for a change made to be 2.4 compliant that is causing Prat not to load properly and throw errors. If you have not downloaded the update posted today, there is no need to update as of now. I rolled back the version to a stable release until the developers can fix this issue.
http://www.twilightonalex.com/index.php?option=com_docman&task=doc_details&Itemid=&gid=95