Fluent meshing : Error: CAR: invalid argument [1]: wrong type [not a pair] Error Obj
 

I am in the process of meshing a fin-tube evaporator model using the water-tight geometry process through Fluent meshing. I had created named selections through Spaceclaim and was trying to update the boundaries through selection by labels when this error message popped up. I have no idea why this happens. I am relatively new to CFD so could someone please assist me with this?