Greetings GIIIPFEL!
We see that this is your first time posting in our forums! 
We’re SO elated to welcome you to the Unreal Engine Community!
We’re sorry that you are having issues compiling the Source Code. One of the great things about sharing the issues you are having is that others have also gone through the same thing or something similar. I’ve found a discussion about this same issue here. Please consider reading through it and discovering if it sheds light on the compilation problem you’re experiencing. Let us know if it helps! Thank you for being an important part of our growing community! 