nwnx_funcs 0.9.3 Some Functions are Faulty

[Guile]

I'm running into an issue with this script....

#include "nwnx_funcs"

void main()
{
object oPC = GetLastUsedBy();
int nStat = NWNXFuncs_GetSavingThrowBonus(oPC, SAVING_THROW_FORT);
string sMsg;
sMsg = "Your Current Fortitude Saving Throw = ";
sMsg += IntToString(nStat);
FloatingTextStringOnCreature(sMsg, oPC);

}

It's always returns -1 no matter what...

Anyone?