error message
 

I'm working on a 3D model in fluent. I started with a coarse model to let fluent refining mesh using adapt option. After refining the model a couple of times, when I try to read the case file, I get an error message: Error: Set_Thread_Variables: wta(real) Error Object: ((constant . 1) (profile "" ""))

Would anybody help me to understand this error message? Thank you.