Status Quo
When users click on "Start" when trying to start a room, sometimes it happens that already somebody else has started the room since loading the page. Then an error message is displayed to the user:
We make the experience that this message is not interesting to users and on the contrary confuses them. Usually they expect to start or join a meeting and do not care which one it is.
Suggestion
Do not show users the error message but handle this internally. If the room has not started yet, start it. If the room is already running, join. No need to show any messages.