Adding Interactivity - Errors!

So I'm not sure what's going on here, I dont get the option to switch the code to "javafx.scene.Node" and it wont run :/ any thoughts?

package sample;

import javafx.application.Application; import javafx.fxml.FXMLLoader;

import javafx.scene.Group; import javafx.scene.Group; import javafx.scene.Parent; import javafx.scene.Scene; import javafx.scene.Scene; import javafx.scene.layout.VBox; import javafx.scene.text.Text; import javafx.stage.Stage;

import java.awt.*;

public class Main extends Application {

@Override
public void start(Stage primaryStage) throws Exception{
    //Parent root = FXMLLoader.load(getClass().getResource("sample.fxml"));
    Group root = new Group();
    Text txt = new Text("Sup?");
    Button btn = new Button();
    btn.setText("Say Sup!");
    txt.setY(50);
    VBox box = new VBox();
    box.getChildren().add(box);
    root.getChildren().add(txt);
    root.getChildren().add(btn);
    primaryStage.setTitle("Sup");
    primaryStage.setScene(new Scene(root, 300, 275));
    primaryStage.show();
}


public static void main(String[] args) {
    launch(args);
}

}

Errors: Error:(26, 12) java: cannot find symbol symbol: method setText(java.lang.String) location: variable btn of type java.awt.Button

Error:(31, 27) java: no suitable method found for add(java.awt.Button) method java.util.Collection.add(javafx.scene.Node) is not applicable (argument mismatch; java.awt.Button cannot be converted to javafx.scene.Node) method java.util.List.add(javafx.scene.Node) is not applicable (argument mismatch; java.awt.Button cannot be converted to javafx.scene.Node)