generator file not found

[wyrm187]

hi everyone - Im new here. I was hoping someone with some experience with the editor could help me out. Whenever I go to generate the landscape - the popup comes up with the slider for quality and speed - I hit enter and get this message - "generator file not found."

what am I doing wrong? do I have to set up all the game parameters before it will let me generate the map? cause I thought I had done that but it isn't working. Any feedback is much appreciated - thank you