java.lang.AssertionError while running swing outline view using Java web start

I have implemented the Outline view for my JTable Tree view mentioned here and here. The implementation is successfully running in eclipse workspace but when I ran the application using Java Web Start. I faced the following issue.

 java.lang.AssertionError: Do resetting of permutation only in AWT queue!
    at org.netbeans.swing.etable.ETable.resetPermutation(ETable.java:1380)
    at org.netbeans.swing.etable.ETable.tableChanged(ETable.java:1268)
    at org.netbeans.swing.outline.Outline.tableChanged(Outline.java:943)
    at javax.swing.JTable.setModel(JTable.java:3698)
    at org.netbeans.swing.etable.ETable.setModel(ETable.java:861)
    at org.netbeans.swing.outline.Outline.setModel(Outline.java:636)
    at javax.swing.JTable.<init>(JTable.java:644)
    at javax.swing.JTable.<init>(JTable.java:572)
    at org.netbeans.swing.etable.ETable.<init>(ETable.java:287)
    at org.netbeans.swing.outline.Outline.<init>(Outline.java:226)

Could you please advice me what could be the reason behind it.

The issue has been resolved by disabling the assertion from the java web start. Modification in JNLP files are

added java-vm-args="-da" in the jnlp file as

<java  href="http://java.sun.com/products/autodl/j2se" version="1.7+"  java-vm-args="-da" initial-heap-size="128m" max-heap-size="512m" />

Thanks @vishal_aim for the hints