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Java Spring Basics Modeling, Storing, and Presenting Data Create a POJO

Why is my model invalid?

I don't know my is my model invalid for the quiz.

com/teamtreehouse/contactmgr/model/Contact.java
public class Contact {
  private Integer id;
  private String firstName;
  private String lastName;
  private String email;

  public Contact(Integer id, String firstName, String lastName, String email) {
    this.id = id;
    this.firstName = firstName;
    this.lastName = lastName;
    this.email = email;
  }
  public Integer getId(){
    return id;
  } 
  public void setId(Integer id){
    this.id = id;
  }
  public String getFirstName(){
    return firstName;
  }
  public void setFirstName(String firstName){
    this.firstName = firstName;
  }
  public String getLastName(){
    return lastName;
  }
  public void setLastName(String lastName){
    this.lastName = lastName;
  }
  public String getEmail(){
    return email;
  }
  public void setEmail(String email){
    this.email = email;
  }
}