CFD Online Discussion Forums - error on initializ

Hello;
Recently I have been used below UDF(that exist in UDF manual) for definition of mass transfer in eulerian fram. udf interpreted and hooked successfully but when initializing appear followed error: Why???

/* UDF to define a simple mass transfer based on Saturation

Temperature. The "from" phase is the gas and the "to" phase is the
liquid phase */
#include "udf.h"
DEFINE_MASS_TRANSFER(liq_gas_source,cell,thread,fr om_index,from_species_index, to_index, to_species_index)
{
real m_lg;
real T_SAT = 373.15;
Thread *gas = THREAD_SUB_THREAD(thread, from_index);
Thread *liq = THREAD_SUB_THREAD(thread, to_index);
m_lg = 0.;
if (C_T(cell, liq) >= T_SAT)
{
m_lg = -0.1*C_VOF(cell,liq)*C_R(cell,liq)*
fabs(C_T(cell,liq)-T_SAT)/T_SAT;
}
if ((m_lg == 0. ) && (C_T(cell, gas) <= T_SAT))
{
m_lg = 0.1*C_VOF(cell,gas)*C_R(cell,gas)*
fabs(T_SAT-C_T(cell,gas))/T_SAT;
}
return (m_lg);
}

Error:
FLUENT received fatal signal (ACCESS_VIOLATION)
1. Note exact events leading to error.
2. Save case/data under new name.
3. Exit program and restart to continue.
4. Report error to your distributor