CUSTOM FUNCTION GIVE ERROR #EVAL!

CUSTOM FUNCTION GIVE ERROR #EVAL!

CUSTEM FUNCTION CREATE KYA ZOHOSHEET ME US FUNCTION KO USE KIYA LEKIN DATA TO SAHI HAI LAKIN DATA SHEET ME NAHI LAG LAHA HAI KRUPYA SOLVE KARE MY CODE IS
float ADDTWO_TWO(float NO1, float NO2)
{
ADD = NO1 + NO2;
return ADD;
}