1.      How can I fix the problem in the following code?

if(input.Shipping_Value != null)

{

               temp = Shipping_Value[ID == input.Shipping_Value];

               input.Product_Cost_Shipping_Method=temp.Shipping_Method;

}

The message is:

Error at line number : 5
Variable 'Product_Cost_Shipping_Method' is already defined of data type 'STRING' but trying to update 'BIGINT' data type.

 

Thank you