You don't say if you have GSX Level 2 installed. KLAS requires it, since it uses for jetways. Of course, it's entirely free to use there, even if you don't own it.
If you have GSX, but you made a customization profile for KLAS *BEFORE* we added SODE jetways, you must remove it. It's a file named KLAS-xxxxx.INI in this folder:
%APPDATA%\Virtuali\GSX
If you have this file, remove it, and start the sim, or Restart Couatl if you are doing it with the simulator running.