RTC Beta2 problem of integration with Rational products

I downloaded a RTC Beta2 version and tried to integrate it with RSA and RSAR. But when I stepped into the wizard page to select which project area to be installed in. There is an error message displayed on the top of the window "null argument" and the 'next step' button is disabled. I'm not sure what's wrong with it? I have tried 1.0.1.1. It works.