DefaultListModel() 'must not be null' error. help!

Hi, I'm new to all this and having a problem with a JList in a JDialog.

I'm trying to list the contents of an ArrayList in the JList and I think I have set this up correctly. However, I get the following error when I try to run the project;

Exception in thread "AWT-EventQueue-0" java.lang.IllegalArgumentException: model must be non null

at javax.swing.JList.setModel(JList.java:1211)

at oop2workagain.RecipeGUI.initComponents(RecipeGUI.java:83)

at oop2workagain.RecipeGUI.<init>(RecipeGUI.java:24)

at oop2workagain.RecipeGUI$5.run(RecipeGUI.java:289)

at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)

at java.awt.EventQueue.dispatchEvent(EventQueue.java:461)

at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:242)

at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)

at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)

at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)

at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)

The part I believe to be correct is as follows;

private void jButton3ActionPerformed(java.awt.event.ActionEvent evt) {

String textName;

textName = ingNameText.getText();

Ingredient.setName(textName);

String textQuantity;

textQuantity = ingQText.getText();

Ingredient.setQuantity(Double.parseDouble(textQuantity));

String textUnit;

textUnit = ingUnitText.getText();

Ingredient.setUnit(textUnit);

ingList.addElement(Ingredient.getName() + " : " + Ingredient.getQuantity() + " : " + Ingredient.getUnit());

ingNameText.setText("");

ingQText.setText("");

ingUnitText.setText("");

Any help with this is much appreciated!

[1868 byte] By [jed199a] at [2007-11-26 17:50:09]