java.lang.ClassCastException: org.jivesoftware.smack.PacketReader$4

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java.lang.ClassCastException: org.jivesoftware.smack.PacketReader$4
at org.jivesoftware.spark.ui.ContactList$15.actionPerformed(ContactList.java:1377)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1849)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2169)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:420)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:258)

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