Reply To: Surface Reaction: UDF: Ansys Fluent Error – reg

[thamilmani]

From just skimming your code, I assume the error could be from

C_P(f, t) 

You are trying to access a cell macro using face_t 

Just like how Rob mentioned, I think UDF has no access to some data that you are trying to use!? So C_P(f, t) could be one.