I am getting an error regarding an incorrect package.... but what should the package be ??

public class Contact {
    private int id;
    private String firstName;
    private String email;
    private String lastName;

    public Contact(String email, String lastName, String firstName, int id) {
        this.email = email;
        this.lastName = lastName;
        this.firstName = firstName;
        this.id = id;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public String getLastName() {
        return lastName;
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }

    public String getFirstName() {
        return firstName;
    }

    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }
}