TextField Nulo que pego do scene Build

private void Editar() {
try {
    if (con != null) {
        FXMLLoader fxmlloader = new FXMLLoader(getClass().getResource("/layout/sql/cadrelat.fxml"));
        // Definindo quem é o controller desse 'fxml':
        fxmlloader.setController(new `enter code here`criaRela(topData.getSelectionModel().getSelectedItem(),con,1));

        Stage stage = (Stage) btnEdit.getScene().getWindow();

        // Carregando o fxml na scene:
        stage.setScene(new Scene(fxmlloader.load()));

        stage.setMaximized(true);
        stage.show();
    }
} catch (Exception | Error ex) {
    ex.printStackTrace();
    new TopException(ex, this.getClass());
}

@Override
public void initialize(URL url,ResourceBundle rb) {

btnSalvar.setOnAction(e -> OnSalvar());
btnCance.setOnAction(e -> OnCance());


 }


public criaRela(TabRela rela, Connection con,int tela) throws Exception {
this.tela = tela;
this.con = con;
if(tela == 0){
//tela = 1;

}else{

this.rela = rela;
try {
    this.aces = new TabAcesDao(con).getRegistro(rela.getCodaces().getCodaces());
} catch (Exception | Error ex) {
    ex.printStackTrace();
}
System.out.println("Acesso: " + aces + "\n" + aces.getPaiaces());

//carregarCombo();
carregarDados(rela, aces);
}
}


private void carregarDados(TabRela rela, TabAces aces) {
try {
    if (con != null) {
        System.out.println(""+aces.getPaiaces());

        txtPaiAce.setText(aces.getPaiaces().toString());              
 }