Undefined function or variable 'CredentialsHeaderE'. Error in rdth

I'm getting this after adding TRTHApi.jar to the java path and trying to connect with rdth(username, password). It's an improvement on the previous errors I was getting but I'm no closer to my beloved tick data.

This question was asked over at Reuters which sent me here: https://community.developers.thomsonreuters.com/questions/21588/matlab-rdth-function-error-message.html