Java SE (Java Platform, Standard Edition)

Hello,

I was trying to build a panel using the JGoodies Forms. I followed the WhitePaper document that was included and have looked over various other examples and I am not sure what I am doing wrong. Here is my code:

private void buildPanel(){
        initComponents();

        FormLayout layout =
            new FormLayout("left:pref, center:pref:grow, left:pref, right:pref", " ");
        DefaultFormBuilder builder = new DefaultFormBuilder(layout);
        builder.setDefaultDialogBorder();
        for (int i = 0; i < modelProgress.length; i++){
            builder.append(modelNumber);

builder.append("");

if ((i+1)%2 == 0){

builder.nextLine();

builder.append(modelProgress[i-1]);

builder.append("");

builder.append(modelProgress[i]);

builder.nextLine();

}

if ((i+1)== modelProgress.length && (i+1)%2 != 0){

builder.nextLine();

builder.append(modelProgress[i]);

builder.nextLine();

}

}

builder.nextLine();

// error is directing me to below line.

builder.append("");

builder.append(overallProgress);

builder.nextLine();

builder.append("");

builder.append("", time);

builder.nextLine();

builder.append("");

builder.append("");

builder.append("", cancel);



this.add(builder.getPanel());

} 


and I am getting this error:

Exception in thread "AWT-EventQueue-0" java.lang.IndexOutOfBoundsException: The row index 14 must be less than or equal to 13.
    at com.jgoodies.forms.layout.CellConstraints.ensureValidGridBounds(CellConstraints.java:962)
    at com.jgoodies.forms.layout.FormLayout.setConstraints(FormLayout.java:822)...

It points me to the commented line. I think it may be with my FormLayout?  I want to have 4 colums and however many rows are necessary based on the modelProgress.length.  Or does it not like me appending ""? 

Any help is greatly appreciated.