Unable to create custom function

Unable to create custom function

Unable to create custom function - Please check the screenshot for the details

HERE IS THE FUNCTION!!

try
    {
        // 1. Fetch the details of the approved Bill using its ID
        billDetails = zoho.books.getRecordById("Bills", organization.get("organization_id"), billId);

        // Check if bill details were successfully fetched and if it contains line items
        if (billDetails.get("code") == 0 && billDetails.get("bill") != null && billDetails.get("bill").get("line_items") != null)
        {
            lineItems = billDetails.get("bill").get("line_items");

            // 2. Iterate through each line item in the Bill
            for each lineItem in lineItems
            {
                itemID = lineItem.get("item_id");
                itemRate = lineItem.get("rate"); // This is the purchase rate for the item on this specific bill line
                itemType = lineItem.get("item_type"); // To ensure we only update 'goods' (inventory) items

                // Ensure itemID and itemRate are valid and it's an inventory item ("goods")
                if (itemID != null && itemRate != null && itemRate > 0 && itemType == "goods")
                {
                    // 3. Prepare a map with the new purchase_price for the item
                    itemUpdateMap = Map();
                    // 'purchase_price' is the API field name for the 'Cost Price' field in the Zoho Books UI
                    itemUpdateMap.put("purchase_price", itemRate); 

                    // 4. Update the item's master record using the Zoho Books API
                    updateResponse = zoho.books.updateRecord("Items", organization.get("organization_id"), itemID, itemUpdateMap);

                    // Check if the update was successful
                    if (updateResponse.get("code") == 0)
                    {
                        info "Successfully updated Purchase Price for Item ID " + itemID + " to " + itemRate + ".";
                    }
                    else
                    {
                        errorMessage = "Failed to update Purchase Price for Item ID " + itemID + ": " + updateResponse.get("message");
                       // error errorMessage;
                    }
                }
                else if (itemType != "goods")
                {
                    info "Skipping non-goods item (ID: " + itemID + ", Type: " + itemType + ") from Bill ID " + billId;
                }
                else
                {
                    info "Skipping line item with invalid itemID or rate (ID: " + itemID + ", Rate: " + itemRate + ") from Bill ID " + billId;
                }
            }
        }
        else
        {
            info "No line items found or bill details could not be fetched for Bill ID: " + billId;
        }
    }
    catch (e)
    {
        //error "An error occurred in updateItemPurchasePriceOnBillApproval function for Bill ID " + billId + ": " + e;
    }