Xcode 6.4/7 crashing after El Capitan beta

Question

I updated my computer to the latest beta that was released to developers last night and the same project that was compiling fine yesterday night now fails due to a supposed

Answer 1

It's documented in the El Capitan Beta 6 Release Notes, so you cannot blame Apple if you didn't read them.

Known Issues

• Xcode 6.x has known compatibility issues when run on OS X El Capitan. It is strongly encouraged that you use Xcode 7 when running on OS X El Capitan.

EDIT Mostly the tone of this answer was brought about by the "This is why we can't have nice things, Apple." statement in question, implying the OP thinks he has a god-given right to use beta operating systems without impunity.