'i got errror in the jam trade function not define please help me im newbie here

 
 int Jam_trade()
{
   bool trade = false;
   if(Mulai_Jam > Akhir_Jam){
     if (Hour() >= Mulai_Jam || Hour() < Akhir_Jam) trade = true;
   } else
     if (Hour() >= Mulai_Jam && Hour() < Akhir_Jam) trade = true;
  
   return (trade);
}
 
i got error in this , trade not define iam newbie here please help me
 

1) please use the SRC button beside the camera!!

2) use Print(..) to see what is going wrong - I my crystal ball told me that the definition of Mulai_Jam and Akhir_Jam might be wrong?