Add a meeting room as Resource

[Blueberries]

I am trying to send a meeting request, by adding one of the meeting rooms as
"Resource".

I received error message: ("....." has declined your meeting because it is
recurring. You must book each meeting seperately with this resource).

I have double checked that i didn't set the meeting request to be
reoccuring. What can be the course of this error message?

Regards