I haven’t seen this before, and am not a mac user, but I think
/Users/admin/Library/Application Support/SuperCollider/Extensions/__MACOSX/ is a metadata folder that you can safely remove to get rid of those errors.
When it gets to loading synths though, I see this:
exception in GraphDef_Recv: exceeded number of interconnect buffers.
That looks more serious, it might mean some synths haven’t been loaded. I haven’t seen this before either but instead of doing
SuperDirt.start you can run the contents of this, most conveniently by putting it in your supercollider startup file: https://github.com/musikinformatik/SuperDirt/blob/develop/superdirt_startup.scd
My guess is that increasing e.g.
s.options.numBuffers should get rid of that error - I’d try doubling it.