I was building and compiling just fine until I was building VST and switched over to AU and accidentally tried to build it before VST was done building. As soon as that happened, this occurred. I assume I corrupted something. I did a time machine backup a few hours ago, so if it is a corrupted file, I could retrieve the fixed files from TM if I was directed to them.
I did find Jules’ post, but the first link to the install is broken (AUs in Xcode), so I made a new post. Any help is greatly appreciated. These sort of errors are above my head.