How to fix this error

How to fix this error

// Get the selected user from the form
selectedUser = input.Meeting_With;

// Fetch the email of the selected user from the User list
attendeeEmailList = Users[Full_Name == selectedUser];

// Check if a valid email was found
if(attendeeEmailList.count() > 0)
{
    attendeeEmail = attendeeEmailList.get(0).Email;
    
    // Sending the email
    sendmail = Map();
    sendmail.put("from","navneet@gmail.com");
    sendmail.put("to",attendeeEmail);
    sendmail.put("subject","New Visitor Registration");
    sendmail.put("message","Hello " + selectedUser + ",\n\nA new visitor has registered for a meeting:\n\nName: " + input.Name + "\nContact Number: " + input.Contact_Number + "\nPurpose of Visit: " + input.Purpose + "\n\nPlease be prepared to meet them.\n\nThank you,\nFoxivision");

    zoho.creator.mail(sendmail);
}
else
{
    info "No valid attendee email found for " + selectedUser;
}