I get the same error, I wondered if I had downloaded the wrong packages too but I downloaded python 2.6 as suggested and then the latest version of qt designer, when I tried to install QT designer it said it detected an older version of python so I downloaded the 2.6 matching version of qt designer and that work without an error message. I assumed then that the version were correct...

I added a few images into the resource I created, could this casue the error?