UDF for specific heat - error
 

Hi everyone，
I have got a probelm with a UDF describing the specific heat of species. When I compile the udf it gives some error.

The udf is shown below.

#include "udf.h"
DEFINE_SPECIFIC_HEAT(ar_spec,T,Tref,h,yi)
{
real cp1,cp2,cp;
if (T<765)
{
cp1=0.95*T+436.65;
cp2=T+10;
}
else
{
cp1=5*T+436;
cp2=50*T+10;
}
cp=C_YI(cell,thread,0)*cp1+C_YI(cell,thread,1)*cp2 ;
*h=cp*(T-Tref);
return cp;
}

Any help would be great.
Thanks.