i have this error and i dont know how to fix it please help

this is the code:

import javax.swing.*;

public class GanttChart extends JFrame {

private JTextArea ganttChartTextArea;

public GanttChart() {

initComponents();

}

private void initComponents() {

ganttChartTextArea = new JTextArea();

setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

setTitle("Gantt Chart");

ganttChartTextArea.setEditable(false);

jScrollPane1.setViewportView(ganttChartTextArea);

javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());

getContentPane().setLayout(layout);

layout.setHorizontalGroup(

layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

.addGroup(layout.createSequentialGroup()

.addContainerGap()

.addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 380, Short.MAX_VALUE)

.addContainerGap())

);

layout.setVerticalGroup(

layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

.addGroup(layout.createSequentialGroup()

.addContainerGap()

.addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 278, Short.MAX_VALUE)

.addContainerGap())

);

pack();

}

public void updateGanttChart(String chart) {

ganttChartTextArea.setText(chart);

}

public static void main(String args[]) {

java.awt.EventQueue.invokeLater(new Runnable() {

public void run() {

new GanttChart().setVisible(true);

}

});

}

}

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