Failed to save the function Variable 'Customer_Name' is not defined

Failed to save the function Variable 'Customer_Name' is not defined

Can anyone help with this.

This is my first go at coding.

Here's my Code.

// Trigger this script when the customer number is entered
// Get the customer number entered by the user
customer_number = input.Customer_Number.toLong();  // Convert the customer number to a long integer

// Fetch all contact records (you can limit the number if needed)
contact_records = zoho.crm.getRecords("Contacts", 1, 5000);

found_record = null;

// Iterate through the records to find the matching Customer Number
for each contact_record in contact_records
{
    if(contact_record.get("Customer_Name").toLong() == customer_number)  // Match the customer number
    {
        found_record = contact_record;
        // Auto-populate the fields in the "System Services" module
        input.Contact_Name = contact_record.get("Contact_Name");      
        input.Phone = contact_record.get("Home_Phone");                 
        input.Mobile = contact_record.get("Mobile");                    
        input.Email = contact_record.get("Email");                      
        input.Council = contact_record.get("Council");                  
        input.Street = contact_record.get("Mailing_Street");            
        input.City = contact_record.get("Mailing_City");                
        input.State = contact_record.get("Mailing_State");              
        input.Postcode = contact_record.get("Mailing_Zip");             
        input.Installation_Date = contact_record.get("Install_Date");   
        break;
    }
}

// Handle the case where the customer number isn't found
if(found_record == null)
{
    info "Customer not found!";
}