JavaFX - представление таблицы заполнения - PropertyValueFactory не является допустимым типом

Question

Я следовал этому уроку: https://docs.oracle.com/javafx/2/fxml_get_started/fxml_tutorial_intermediate.htm#CACFHDEJ

И мое первое заполнение TableView просто отлично.Но мой второй на другом этапе нет.Я получаю сообщение об ошибке: «javafx.fxml.LoadException: PropertyValueFactory не является допустимым типом».* Everytimeвыглядит следующим образом:

/*
 * To change this license header, choose License Headers in Project 
Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package MainGui;

import algorithm.ObjectValuePair;
import java.net.URL;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.ResourceBundle;
import javafx.collections.ObservableList;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.control.TextField;
import javafx.scene.layout.AnchorPane;
import javafx.stage.Stage;
import org.json.simple.JSONObject;

/**
 * FXML Controller class
 *
 * @author 
 */
public class DetailViewController implements Initializable {

@FXML
private TextField txtfdName;
@FXML
private TextField txtfdGroup;
@FXML
private TextField txtfdSecGroup;
@FXML
private TextField txtfdTel;
@FXML
private TextField txtfdFax;
@FXML
private TextField txtfdStreet;
@FXML
private TextField txtfdNumber;
@FXML
private TextField txtfdPlz;
@FXML
private TextField txtfdCity;
@FXML
private TextField txtfdWebsite;
@FXML
private TextField txtfdMail;
@FXML
private TextField txtfdBdl;

private String title;
private DetailedCustomer dc;
@FXML
private AnchorPane ap;
@FXML
private TableView<PartnerOverview> tblData;

/**
 * Initializes the controller class.
 */
@Override
public void initialize(URL url, ResourceBundle rb) {

}

@FXML
private void onActionChange(ActionEvent event) {
}

public void setDetailedCusotmerBasics(String id, JsonDatabaseConnector jdc){
    dc = new DetailedCustomer(id, jdc);
    this.txtfdBdl.setText(dc.getBdl());
    this.txtfdName.setText(dc.getName());
    this.txtfdGroup.setText(dc.getGroup());
    this.txtfdSecGroup.setText(dc.getSubGroup());
    this.txtfdTel.setText(dc.getTel());
    this.txtfdFax.setText(dc.getFax());
    this.txtfdStreet.setText(dc.getStreet());
    this.txtfdNumber.setText(dc.getHnr());
    this.txtfdPlz.setText(dc.getPlz());
    this.txtfdCity.setText(dc.getCity());
    this.txtfdWebsite.setText(dc.getSite());
    this.txtfdMail.setText(dc.getMail());
    /*ArrayList<JSONObject> search = dc.getPartner();

    if(search != null){
        int size = search.size();
        for(int i = 0; i < size; i++){
            ObservableList<PartnerOverview> data = tblData.getItems();
            data.add(new PartnerOverview(search.get(i)));
        }
    }*/
    ObservableList<PartnerOverview> data = tblData.getItems();
    data.add(new PartnerOverview("awd", "awd", "adw", "awd", "adw", "awd", "adw", "awd"));

}    



}

И мой PartnerOverview выглядит так:

/*
 * To change this license header, choose License Headers in Project 
Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package MainGui;

import javafx.beans.property.SimpleStringProperty;
import org.json.simple.JSONObject;

 /**
 *
 * @author 
 */
public class PartnerOverview {
private SimpleStringProperty firstName = new SimpleStringProperty("");
private SimpleStringProperty name = new SimpleStringProperty("");
private SimpleStringProperty position = new SimpleStringProperty("");
private SimpleStringProperty tel = new SimpleStringProperty("");
private SimpleStringProperty mobil = new SimpleStringProperty("");
private SimpleStringProperty mail = new SimpleStringProperty("");
private SimpleStringProperty bday = new SimpleStringProperty("");
private SimpleStringProperty hobby = new SimpleStringProperty("");

public PartnerOverview(){
    this("","","","","","","","");
}

public PartnerOverview(String firstName, String name, String position, String tel, String mobil, String mail, String bday, String hobby){
    this.firstName.set(firstName);
    this.name.set(name);
    this.position.set(position);
    this.tel.set(tel);
    this.mobil.set(mobil);
    this.mail.set(mail);
    this.bday.set(bday);
    this.hobby.set(hobby);
}

public PartnerOverview(JSONObject obj){
    this.firstName.set((String) obj.get("Vorname")); 
    this.name.set((String) obj.get("Name")); 
    this.position.set((String) obj.get("Funktion"));
    JSONObject address = (JSONObject) obj.get("Adresse");
    this.tel.set((String) address.get("Durchwahl"));
    this.mobil.set((String) address.get("MobilTel"));
    this.mail.set((String) address.get("eMail"));
    this.bday.set((String) address.get("Geburtstag"));
    this.hobby.set((String) address.get("Hobbys"));
}

 public String getFirstName() {
    return firstName.get();
}

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

public String getName() {
    return name.get();
}

public void setName(String name) {
    this.name.set(name);
}

public String getPosition() {
    return position.get();
}

public void setPosition(String position) {
    this.position.set(position);
}

public String getTel() {
    return tel.get();
}

public void setTel(String tel) {
    this.tel.set(tel);
}

public String getMobil() {
    return mobil.get();
}

public void setMobil(String mobil) {
    this.mobil.set(mobil);
}

public String getMail() {
    return mail.get();
}

public void setMail(String mail) {
    this.mail.set(mail);
}

public String getBday() {
    return bday.get();
}

public void setBday(String bday) {
    this.bday.set(bday);
}

public String getHobby() {
    return hobby.get();
}

public void setHobby(String hobby) {
    this.hobby.set(hobby);
}



}

Я не вижу никаких проблем, и раньше он работал на моем другом классе fxml.Кто-нибудь может помочь?