"Could not create <thing> is the file missing?" When not even using it

I'm currently making a map and every time it starts up it tells me that first, it could not find "defaulttree" which I can't find anywhere in the files of the game, and it also can't find any of the utah_rock files. I didn't even use any of the utah rocks in the map. I have no idea where defaulttree is. How can I make these messages not appear?

 

Cant tell for sure without seeing the map but its most likely coming from the "yourmap.forest" file, especially if you used another map to get started. If you havnt gottent o the point of placing trees and other forest items yet, just delete that file

 

I've already placed mass amounts of trees and rocks, and I want to keep the map kind of a secret so I'll pm you a birds eye screenshot of the trees