Errors when interpreting UDF
 

I wrote a udf for thermal conductivity dependent on a temperature.
#include "udf.h"
DEFINE_PROPERTY(cell_thermalconductivity,cell,thre ad)
{
real ktc;
real temp = C_T(cell,thread);
ktc=(0.6*(1+(0.023*((pow(temp,1.2321))/(pow(10,(363.94/(temp-140))))))));
}
when I run fluent,I see this error:
Error: Floating point error: invalid number
Error Object: ()
could you help me?
thanks

Your Define_Property UDF should at least return some value to the solver.
A last line like: return ktc; would do this.
cheers

thank you so much!
it worked