in Joomla 1.7 unable to use ?tp=1 - error 500

When trying to see where my modules where using the '?tp=1' method I was getting a 500 error

' unable to load renderer class '


After rolling back to a previous version that worked I saw that it was a problem with the last module I had installed which was ' Share This for Joomla ' - > mod_JoomlaShareThis_j17

I have contacted the programmers so will let you know if I get a response.