Model Error Message forrtl: error (65): floating invalid

Hello, I run a model of lagrangian, but got an error notification " forrtl: error (65): floating invalid ", I already checked the previous question about the same error and the answer was talk about the timestep and courant number.

So, I changed my timestep and checked the courant number. Now, this simulation is using 10 s time step and the courant number already lower than 4, but It's still error. May I know how to fix it?

Thanks in advance