BRT Installation Error "Path of RailTrack not set in RailTrackAT.cfg"

Hi all

I have been trying to install BRT, I currently have microstation SS3 installed. When I try and install BRT I get a message that states:-

"Path of RailTrack not set in RailTrackAT.cfg"

When I select okay the installation rolls back and BRT does not install.

Does anyone know what could be wrong?

Attached is a screen shot of the message:-