Passing Information from one controller to another

I am currently new to JavaFx and encountering these errors when trying to pass text from a text field from one scene to another. The entire process is handled by controllers as below:

below is my login controller accessed from the main page:

public class LoginController {

    @FXML
    public TextField username;

    public void login(ActionEvent event) throws IOException {
        String usernameInfo = username.getText();

        FXMLLoader fxmlLoader = new FXMLLoader(getClass().getResource("home.fxml"));
        Stage stage = (Stage) ((Node) event.getSource()).getScene().getWindow();
        Scene scene = new Scene(fxmlLoader.load());

        HomeController home = fxmlLoader.getController();
        home.displayName(usernameInfo);

        stage.setScene(scene);
        stage.setTitle("Home Page");
        stage.show();
    }

}

below is my home page controller that is supposed to be accessed after a login:

public class HomeController {
    @FXML
    public Label usernameLabel;

    public void displayName(String username) {
        usernameLabel.setText("Hi there," + username);
    }
}

these are the two errors i am encountering when running the application the moment i click a login button that invokes the login method above

Caused by: java.lang.reflect.InvocationTargetException

Caused by: java.lang.IllegalStateException: Location is not set.

Can you help explain what am I doing wrong?

I looked up similar issues where the location to the home.fxml needs to be an absolute path i.e

FXMLLoader fxmlLoader = new FXMLLoader(getClass().getResource("home.fxml"));

to

FXMLLoader fxmlLoader = new FXMLLoader(getClass().getResource("com/example/secondlessons/home.fxml"));

and i still get the same error