Track maker problem

[Bram22]

Good evening,

I am making my first track for MX Bikes. I'm following a tutorial from the MotoX Collective on you tube. I am making a replica from my home track in Holland. i am now on part 2. I have a hightmap and a texture that i wanted to test, everything is the right size and file but when i try to open the track in game my game crashes. can someone please help?

(PS sorry for my bad English, I'm Dutch.)

Thank you in advance