为什么在Java中会出现javafx.fxml.LoadException

我正在为我的学校项目制作数独游戏，需要打开一个新窗口，在那里列出高分，但是每次我点击菜单项，控制台就会抛出错误，我不知道我能做什么

我已经试着在互联网上寻找一些东西，但我所做的一切都导致了同样的错误

package controller;

import java.io.IOException;
import java.net.URL;
import java.util.ResourceBundle;
import javafx.event.EventHandler;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.fxml.Initializable;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.canvas.Canvas;
import javafx.scene.canvas.GraphicsContext;
import javafx.scene.control.Button;
import javafx.scene.input.MouseEvent;
import javafx.scene.layout.VBox;
import javafx.scene.paint.Color;
import javafx.scene.text.Font;
import javafx.stage.Modality;
import javafx.stage.Stage;
import model.GameBoard;

public class Controller implements Initializable {

    @FXML
    Button button_one;
    @FXML
    Button button_two;
    @FXML
    Button button_three;
    @FXML
    Button button_four;
    @FXML
    Button button_five;
    @FXML
    Button button_six;
    @FXML
    Button button_seven;
    @FXML
    Button button_eight;
    @FXML
    Button button_nine;
    @FXML
    Canvas canvas;

    GameBoard gameboard;

    int psr; // ausgewählte reihe
    int psc; // ausgewählte spalte



    @Override
    public void initialize(URL location, ResourceBundle resources) {
        gameboard = new GameBoard();
        psr = 0;
        psc = 0;
        GraphicsContext context = canvas.getGraphicsContext2D();
        try {
            drawOnCanvas(context);
        } catch (IOException e) {

            e.printStackTrace();
        }

    }

    public void drawOnCanvas(GraphicsContext context) throws IOException {
        context.clearRect(0, 0, 450, 450);
        for (int row = 0; row < 9; row++) {
            for (int col = 0; col < 9; col++) {
                int posy = row * 50 + 2;
                int posx = col * 50 + 2;
                int width = 46;
                context.setFill(Color.LIGHTGRAY);
                context.fillRoundRect(posx, posy, width, width,10,10);
            }
        }
        context.setStroke(Color.RED);
        context.setLineWidth(2);
        context.strokeRoundRect(psc * 50 + 2, psr * 50 + 2, 46, 46, 10, 10);

        int[][] initial = gameboard.getInitial();
        for (int row = 0; row < 9; row++) {
            for (int col = 0; col < 9; col++) {
                int posy = row * 50 + 30;
                int posx = col * 50 + 20;
                context.setFill(Color.BLACK);
                context.setFont(new Font(20));
                if (initial[row][col] != 0) {
                    context.fillText(initial[row][col] + "", posx, posy);
                }

            }
        }

        int[][] player = gameboard.getPlayer();
        for(int row = 0; row < 9;row++) {
            for(int col = 0; col < 9; col++) {
                int posy = row * 50 + 30;
                int posx = col * 50 + 20;
                context.setFill(Color.RED);
                context.setFont(new Font(20));
                if(player[row][col] != 0) {
                    context.fillText(player[row][col] + "", posx, posy);
                }
            }
        }


        //Die vier Linien für die 3x3 Trennung
        context.setStroke(Color.BLACK);
        context.strokeLine(450, 150, 0, 150);
        context.strokeLine(450, 300, 0, 300);
        context.strokeLine(150, 0, 150, 450);
        context.strokeLine(300, 0, 300, 450);
        context.setLineWidth(3);


        if(gameboard.checkSuccess()) {
            context.clearRect(0, 0, 450, 450);
            context.setFill(Color.GREEN);
            context.setFont(new Font(36));
            context.fillText("SUPER!", 150, 200);
            newWindow();






        }



    }

    public void canvasMouseClick() throws IOException{
        canvas.setOnMouseClicked(new EventHandler<MouseEvent>() {

            @Override
            public void handle(MouseEvent event) {
                int mousex = (int) event.getX();
                int mousey = (int) event.getY();

                psr = (int) (mousey / 50);
                psc = (int) (mousex / 50);

                // System.out.println(psr + "," + psc);

                try {
                    drawOnCanvas(canvas.getGraphicsContext2D());
                } catch (IOException e) {

                    e.printStackTrace();
                }

            }
        });

    }







public void button1pressed() throws IOException{
                gameboard.modifyPlayer(1, psr, psc);
                drawOnCanvas(canvas.getGraphicsContext2D());

            }




public void button2pressed() throws IOException{
            gameboard.modifyPlayer(2, psr, psc);
            drawOnCanvas(canvas.getGraphicsContext2D());

        }







public void button3pressed() throws IOException{
            gameboard.modifyPlayer(3, psr, psc);
            drawOnCanvas(canvas.getGraphicsContext2D());

           }





 public void button4pressed() throws IOException{
            gameboard.modifyPlayer(4, psr, psc);
            drawOnCanvas(canvas.getGraphicsContext2D());

         }




public void button5pressed() throws IOException{
            gameboard.modifyPlayer(5, psr, psc);
            drawOnCanvas(canvas.getGraphicsContext2D());

         }





public void button6pressed() throws IOException{
            gameboard.modifyPlayer(6, psr, psc);
            drawOnCanvas(canvas.getGraphicsContext2D());
        }





public void button7pressed() throws IOException{
            gameboard.modifyPlayer(7, psr, psc);
            drawOnCanvas(canvas.getGraphicsContext2D());
        }





public void button8pressed() throws IOException {
            gameboard.modifyPlayer(8, psr, psc);
            drawOnCanvas(canvas.getGraphicsContext2D());
        }





public void button9pressed() throws IOException {
            gameboard.modifyPlayer(9, psr, psc);
            drawOnCanvas(canvas.getGraphicsContext2D());
        }





    public void neuesSpiel() throws IOException {
        gameboard = new GameBoard();
        psr = 0;
        psc = 0;
        GraphicsContext context = canvas.getGraphicsContext2D();
        drawOnCanvas(context);
    }

    public void newWindow() throws IOException {

        try {
            FXMLLoader fxmlLoader = new FXMLLoader(getClass().getResource("/controller/highscore.fxml"));
            VBox root1 = (VBox) fxmlLoader.load();
            Stage stage = new Stage();
            stage.setScene(new Scene(root1));  
            stage.show();
        } catch(Exception e) {
            e.printStackTrace();
        }


    }



}

表明错误在控制器类的第58行。这似乎是这一行：

GraphicsContext context = canvas.getGraphicsContext2D();

如果是这样，那么如果

canvas

为空，就会发生这种情况

通过确保正确实例化了

canvas

，您很可能能够解决此错误，但如果需要进一步的帮助，您可以阅读更多内容

表明错误在控制器类的第58行。这似乎是这一行：

GraphicsContext context = canvas.getGraphicsContext2D();

如果是这样，那么如果

canvas

为空，就会发生这种情况

---

通过确保正确实例化了

canvas

，您很可能能够解决错误，但如果需要进一步帮助，您可以阅读更多。

您的

canvas

在FXML文件中是否有

fx:id=“canvas”

属性？您的

canvas

是否有

fx:id=“canvas”

FXML文件中的属性？

GraphicsContext context = canvas.getGraphicsContext2D();