xcode is 8.2.1
I also just tried installing UE 4.10 to see if that would help things, too.
Yes, I have never been able to get into Unreal properly. Just the startup screen with the options for making a new project. I’m not sure what a blueprint project is, but I just tried starting that up and it seems to load fine. I then tried creating a new C++ project and ran into the same error.
Thanks for the reply! I’m more than happy to try any other suggestions you may have.