Dragonscape ip changer V2
Tried others

Code:
Server: propk.no-ip.biz43594 is ONLINE
java.lang.NullPointerException
	at org.jvnet.substance.SubstanceRootPaneUI.setMaximized(SubstanceRootPaneUI.java:656)
	at org.jvnet.substance.SubstanceRootPaneUI.installWindowListeners(SubstanceRootPaneUI.java:296)
	at org.jvnet.substance.SubstanceRootPaneUI.installClientDecorations(SubstanceRootPaneUI.java:546)
	at org.jvnet.substance.SubstanceRootPaneUI.propertyChange(SubstanceRootPaneUI.java:727)
	at java.beans.PropertyChangeSupport.firePropertyChange(Unknown Source)
	at java.beans.PropertyChangeSupport.firePropertyChange(Unknown Source)
	at java.beans.PropertyChangeSupport.firePropertyChange(Unknown Source)
	at java.awt.Component.firePropertyChange(Unknown Source)
	at javax.swing.JComponent.firePropertyChange(Unknown Source)
	at javax.swing.JRootPane.setWindowDecorationStyle(Unknown Source)
	at javax.swing.JFrame.frameInit(Unknown Source)
	at javax.swing.JFrame.<init>(Unknown Source)
	at client2.<init>(client2.java:97)
	at client2.main(client2.java:31)
I also sometimes get this,



How can I fix this?