Zoho Deluge Script Error: Variable Not Defined for Custom Function

I'm working on a custom function in Zoho CRM to calculate the total price of an order when a new record is created in a custom module called Orders. The function is triggered via a workflow rule. The fields in question are dropdowns, and their API names are confirmed to be correct.

Here’s the script I’m using:

void automation.TotalPriceCalc() {
    // Retrieve values from the order
    personalization = input.Personalization_Option;
    dividers = input.D_Dividers;
    dodts = input.DoDts;

    total_price = 0;

    if (personalization == "One Letter") {
        total_price = total_price + 119;
    } else if (personalization == "Two Names") {
        total_price = total_price + 235;
    }

    if (dividers == "One Small") {
        total_price = total_price + 55;
    }

    if (dodts == "One") {
        total_price = total_price + 15;
    }

    // Update Total Price field
    input.Total_Price = total_price; 
}

Field Details:

Personalization_Option: Dropdown field.
D_Dividers: Dropdown field.
DoDts: Dropdown field.

The Issue:

When I try to run this script, I get the following error:

Variable 'Personalization_Option' is not defined.

I get the same error for the two other fields.

What I’ve Tried:

• Verified the API names for all fields in the Orders module under the module settings.
• Confirmed that the workflow is set to trigger when a new record is created in the Orders module.

Questions:

• Why is Zoho Deluge throwing a "Variable not defined" error even though the API names are confirmed?
• Is there an issue with how I’m accessing dropdown fields in the input object?
• How can I ensure the dropdown fields are properly retrieved and used in the function?

Any insights or suggestions would be greatly appreciated!