When solving the source code I keep getting the following error

What am I doing wrong $??$

Customer.java

package daway.s;

private class Customer $\{$

$\}$

private String name;

private String address;

private String phone;

private String email;

private String petName;

private String petType;

private int petAge;

private double petWeight;

public class Customer $($public Customer$($String name, String address, String phone, String email, String petName, String petType, int petAge, double petWeight$))\{$

$\{$

this.name $=$ name;

this.address $=$ address;

this.phone $=$ phone;

this.email $=$ email;

this.petName $=$ petName;

this.petType $=$ petType;

this.petAge $=$ petAge;

this.petWeight $=$ petWeight;

$\}$

public String getName$()\{$

return name;

$\}$

public String getAddress$()\{$

return address;

$\}$

public String getPhone$()\{$

return phone;

$\}$

public String getEmail$()\{$

return email;

$\}$

public String getPetName$()\{$

return petName;

$\}$

public String getPetType$()\{$

return petType;

$\}$

public int getPetAge$()\{$

return petAge;

$\}$

public double getPetWeight$()\{$

return petWeight;

$\}$

$\}$

Invoice. Java

package daway.s;

public class Invoice

$\{$

private static final double SALES$\_$TAX$\_$RATE $=0\mathrm{.}0925$;

private Customer customer;

private double serviceCharges;

private double medicationCharges;

public Invoice$($Customer customer, double serviceCharges, double medicationCharges$)\{$

this.customer $=$ customer;

this.serviceCharges $=$ Math.max$(0,$ serviceCharges$)$;

this.medicationCharges $=$ Math.max$(0,$ medicationCharges$)$;

$\}$

private double calculateSalesTax$()\{$

return Math.round$($serviceCharges $*$ SALES$\_$TAX$\_$RATE $*100\mathrm{.}0)/100\mathrm{.}0$;

$\}$

public double calculateTotalCharges$()\{$

return serviceCharges $+$ medicationCharges $+$ calculateSalesTax$()$;

$\}$

public void printInvoice$()\{$

DecimalFormat df $=$ new DecimalFormat$("$#$\mathrm{.}00")$;

System.out.println$("$Customer Name: $"+$ customer.getName$())$;

System.out.println$("$Customer Address: $"+$ customer.getAddress$())$;

System.out.println$("$Customer Phone: $"+$ customer.getPhone$())$;

System.out.println$("$Customer Email: $"+$ customer.getEmail$())$;

System.out.println$("$Pet Name: $"+$ customer.getPetName$())$;

System.out.println$("$Pet Type: $"+$ customer.getPetType$())$;

System.out.println$("$Pet Age: $"+$ customer.getPetAge$())$;

System.out.println$("$Pet Weight: $"+$ customer.getPetWeight$())$;

System.out.println$("$Service Charges: $$"+$ df$.$format$($serviceCharges$))$;

System.out.println$("$Medication Charges: $$"+$ df$.$format$($medicationCharges$))$;

System.out.println$("$Sales Tax: $$"+$ df$.$format$($calculateSalesTax$()))$;

System.out.println$("$Total Charges: $$"+$ df$.$format$($calculateTotalCharges$()))$;

$\}$

$\}$

Main.java

package daway.s;

import java.util.Scanner;

public class Main $\{$

public static void main$($String$[]$ args$)$

$\{$

java.util.Scanner scanner $=$ new java.util.Scanner$($System$.$in$)$;

System.out.print$("$Enter customer name: $")$;

String name $=$ scanner.nextLine$()$;

System.out.print$("$Enter customer address: $")$;

String address $=$ scanner.nextLine$()$;

System.out.print$("$Enter customer phone number: $")$;

String phone $=$ scanner.nextLine$()$;

System.out.print$("$Enter customer email: $")$;

String email $=$ scanner.nextLine$()$;

System.out.print$("$Enter pet name: $")$;

String petName $=$ scanner.nextLine$()$;

System.out.print$("$Enter pet type: $")$;

String petType $=$ scanner.nextLine$()$;

System.out.print$("$Enter pet age: $")$;

int petAge $=$ scanner.nextInt$()$;

System.out.print$("$Enter pet weight: $")$;

double petWeight $=$ scanner.nextDouble$()$;

System.out.print$("$Enter service charges: $")$;

double serviceCharges $=$ scanner.nextDouble$()$;

System.out.print$("$Enter medication charges: $")$;

double medicationCharges $=$ scanner.nextDouble$()$;

Customer customer $=$ new Customer$($name$,$ address, phone, email, petName, petType, petAge, petWeight$)$;

Invoice invoice $=$ new Invoice$($customer$,$ serviceCharges, medicationCharges$)$;

invoice.printInvoice$()$;

scanner.close$()$;

$\}$

$\}$