I tried to add the clang_complete plugin to my vim. https://github.com/xavierd/clang_complete
After I added it, I get a large error page before I can open any C++ file. The autocomplete still does not work. I looked through some old threads and wondered if it could be because I don't have a +python3 on my :version page. I followed the steps here to try to activate python3, but I still have a -python3.
Is this error because of that?
I use a Mac.

+python3? Are you using Homebrew? On the Mac it's probably the easiest way to get it working... Make sure you're running the Homebrew binary and not the system one. – filbranden Jun 05 '20 at 14:24cocplugin, which is much easier to setup. – Waqar Jun 09 '20 at 08:27