I can't get this running because its saying someone else is using my licence. they"re not

I’m using cinema 4D and getting and error saying someone is using my licence. The person is ME. I’ve reinstalled both C4D AND Corona. SAME ERROR MESSAGE. Something about Chaos Unified Login. I look on the licenses on the website and it says “Available”.
PLease help me NOW. I HAVE A DEADLINE IN 3 HOURS!!!