Started playing Lonesome Road again, only to be greeted with the runtime error R6025 which is pure virtual function call.

I had that when Lonesome Road was first released but not using the New Vegas Script Extender cured that problem but this time even without the New Vegas Script Extender it comes up with that error.

Edit: Forgot to say where it happens, it starts up when entering Hopesville from the silo the player enters at the start of Lonesome Road