JavaFX .addAll() error with my own class?

        @Override
    public void start(Stage primaryStage) throws Exception {
        primaryStage.setTitle("Java Project");
        Scene scene;

        //File chooser
        FileChooser fileChooser = new FileChooser();

        Button button = new Button("Select Network File");
        button.setOnAction(e -> {
            String selectedFile = fileChooser.showOpenDialog(primaryStage).toString();
            Path file = Paths.get(selectedFile);
            System.out.println(file);
        });
        
        
        //Checkboxes
        Checkbox intBox = new Checkbox("Add interaction:");
        Checkbox degBox = new Checkbox("Get degree of node:");
        
        
        //Layout
        VBox layout = new VBox(10);
        layout.getChildren().addAll(button, intBox, degBox);
        layout.setAlignment(Pos.CENTER);

        primaryStage.setScene(scene);
        primaryStage.show();    
    }
}

on the .addAll() line, I'm getting error: The method addAll(int, Collection<? extends Node>) in the type List<Node> is not applicable for the arguments (Button, Checkbox, Checkbox

But I'm not extending Node anywhere? the Main class extends Application.

This is the Node class:

package application;

public class Node {

    public String name;
    
    public Node() {
        this.name = "";
    }

    public Node(String n) {
        this.name = n;
    }
    
    public String printName() {
        return name;
    }

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + ((name == null) ? 0 : name.hashCode());
        return result;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (obj == null)
            return false;
        if (getClass() != obj.getClass())
            return false;
        Node other = (Node) obj;
        if (name == null) {
            if (other.name != null)
                return false;
        } else if (!name.equals(other.name))
            return false;
        return true;
    }
    
}