IOEXCEPTION错误在FXML中一次又一次。试图将FXML文件放在ListView中的列表元素上

Question

public class PopupController  {
    public ListView<String> listView;
    public Button addWalletButton;
    public PieChart piechart;
    public Label size;
    private WalletModel walletModel = Factory.inject(WalletModel.class);

    @FXML
    public void initialize() throws IOException {


        listView.setCellFactory(param -> new EditableCell());
        addWalletButton.setOnMouseClicked(event -> {
            walletModel.CreateWallet();
            listView.getFixedCellSize();
            listView.getItems().add("Wallet " + walletModel.WalletSize());
            size.setText("Total Wallets:  " + walletModel.WalletSize());
        });
        size.setText("Wallet Size " + walletModel.WalletSize());
        listView.getItems().add("Wallet 1");
    }

    private class EditableCell extends ListCell<String>{

        private final TextField textField;

        EditableCell() throws IOException {
            textField = new TextField();
            setGraphic(FXMLLoader.load(getClass().getResource("/selectbutton.fxml")));
        }

        @Override
        protected void updateItem(String item, boolean empty) {
            super.updateItem(item, empty);
            if(empty){
                textField.setVisible(false);
            }
            else{
                textField.setVisible(true);
                textField.setText(item);
            }
        }
    }



}

它在initialize（）方法的第一条语句中显示错误。

我试图通过按钮（“添加钱包”）将fxml文件放在列表元素上。我在下面附加了我的fxml代码。

我没有收到stacktrace，因为它显示了编译错误

<AnchorPane prefHeight="27.0" prefWidth="69.0" xmlns="http://javafx.com/javafx/8.0.121"
            xmlns:fx="http://javafx.com/fxml/1" fx:controller="com.gazman.coco.desktop.controllers.PopupController">
    <Button fx:id="select" layoutX="6.0" layoutY="2.0" mnemonicParsing="false" text="Button"/>
</AnchorPane>