Whats causing all these errors in my GUI?

I'm trying to work on my GUI coding so am taking it upon myself just to create several different interfaces for examples I had been given in class.

Im trying to create a GUI here that at the top has Labels followed by their respective text fields for the user to input, with one on top of the other. I then want this to be followed by a series of two buttons and finally a results field that is uneditable (as will later introduce some fields for results) and opaque. I get a whole series of errors so was wondering if I am just doing something stupid wrong.

The code for the panel is here:

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.BorderFactory;
import javax.swing.Box;
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;

public class GradePanel extends JPanel {

private JButton addEntry, calculate;
private JLabel name, grade;
private JTextField nameField, gradeField, resultField;

public GradePanel() {

    // Button to add entry to list
    addEntry = new JButton("Add entry to list");
   // addEntry.addActionListener(new tempListener());

    // Button to print all entries in correct format
    calculate = new JButton("Print all user grades");
   // calculate.addActionListener(new tempListener());

    //Create Labels
    name = new JLabel("Enter student name: ");
    nameField = new JTextField(10);
   // nameField.addActionListener(new tempListener());

    grade = new JLabel("Enter students mark: ");
    gradeField = new JTextField(5);
    // gradeField.addActionListener(new tempListener());

    //Bottom segment for result
    resultField = new JTextField();
    resultField.setOpaque(false);
    resultField.setEditable(false);

    setLayout(new BorderLayout());

    //Bottom Panel
    JPanel GradePanel = new JPanel();
    GradePanel.setBorder(BorderFactory.createTitledBorder("Students/Results"));
    GradePanel.setOpaque(false);
    GradePanel.add(resultField);

    //Button Panel
    JPanel ButtonPane = new JPanel();
    ButtonPane.add(addEntry, BoxLayout.LINE_AXIS);
    ButtonPane.add(calculate, BoxLayout.LINE_AXIS);

    //Label Panel
    JPanel labelPane = new JPanel();
    labelPane.add(name);
    labelPane.add(Box.createRigidArea(new Dimension (5,0)));
    labelPane.add(nameField);
    labelPane.add(Box.createRigidArea(new Dimension (0,2)));
    labelPane.add(grade);
    labelPane.add(Box.createRigidArea(new Dimension (5,0)));
    labelPane.add(gradeField);

    //Add all panels to the main panel
    add(labelPane, BorderLayout.NORTH); 
    add(ButtonPane, BorderLayout.CENTER);
    add(GradePanel, BorderLayout.SOUTH);

    setBackground(Color.WHITE);
    setPreferredSize(new Dimension(400, 300));
}

Thanks in advance!