Custom created tech tree does not work...

Ok, either i'm blind or stupid or both...but i didn't find any post regarding my problem.

I created my own tech tree (i used the minor races tree and added some techs, removed others). I can choose it in the tech tree selection when i play a custom race. But when i try to start the game it crashes to desktop. No problems and chrashes whatsoever with the game so far.

What did i do wrong?

There is also a "TODO: display name"-tech that i did not create, but i can choose it as a starting tech...???

Many thanks in advance!