Floting point expection after simulating case and data file
 

Dear expert,
could you please tell me why the floating point exceptional problem is occurring while I read the after-timesteps case and data file?
I am solving the 2D case with the UDF function due to power fluctuation when I read the latest data and case file and run the simulation floating point exception comes while I do not disturb anything. Maybe UDF has not taken when I read new data and case file for that I compile again UDF even same problem is occurring. pls, suggest.