my problem is gone. I deinstalled all the p drive shittery from steam and used Mikero tools to do the job. Now I can see textures and everything is fine.
I've followed another guide on youtube this time and now the error is away. But the island is still white with no texture at all. I've done everything like him and its still not working.
Here are some informations:
Buldozer launch parameters:
In the TerrainBuilder everything looks fine but as soon as I get into the Buldozer I get an error message and cant see any textures.
If you need any more screenshots or informations pls contact me