what’s the symptom?
i tried domain mapping together with exclude plugins and no error found.
you can see sandbox.keepress.com will lead you to the mapped domain which is waskitho.co.cc and yes the exclude plugin is active and running well.
Please upgrade to Calotropis 1.2.5. It’s not in the official Theme Directory yet because the very long queue in the reviewing process by WordPress reviewing team. For now, you can download from here.