You cannot start the meeting because it is hosted by another user

[SAZ]

I have Zoom linked to my booking system (Wix) and when I try to open my meeting, I keep getting this message: 

You cannot start the meeting because it is hosted by another user

I have logged out/in again - tried looking at the booking system and linked the accounts. Nothing seems to work and my meeting attendees are also getting the message: Meeting invalid. 

Does anyone know what I can do? Thank you!!!