I installed the component / module what ever it is...all ok...But my frontend of the website stopped working. So i decided to uninstall then my frontend website came back BUT my backend(admin) is now unaccessible.
In my opinion this is not as good as I thought. So I am now having to trouble getting my joomla reinstalled.
I am not going to install this ever again and use an alternative solution.
Sorry this was a bug in the release candidate. It is now fixed and should work as expected.