soapUI 3.6.1 failed to launch

Hi, I'm new to soapUI. I just installed soapUI 3.6.1, and it failed to launch when I clicked on the icon.
It threw a java.lang.NullPointerException and below is the error from error.log
java.lang.NullPointerException
at com.eviware.soapui.support.components.JPropertiesTable.<init>(JPropertiesTable.java:90)
at com.eviware.soapui.impl.EmptyPanelBuilder.buildDefaultProperties(EmptyPanelBuilder.java:56)
at com.eviware.soapui.impl.WorkspaceImplPanelBuilder.buildOverviewPanel(WorkspaceImplPanelBuilder.java:36)
at com.eviware.soapui.impl.WorkspaceImplPanelBuilder.buildOverviewPanel(WorkspaceImplPanelBuilder.java:26)
at com.eviware.soapui.SoapUI$InternalNavigatorListener.nodeSelected(SoapUI.java:1093)
at com.eviware.soapui.ui.Navigator$InternalTreeSelectionListener.valueChanged(Navigator.java:302)
at javax.swing.JTree.fireValueChanged(Unknown Source)
at javax.swing.JTree$TreeSelectionRedirector.valueChanged(Unknown Source)
at javax.swing.tree.DefaultTreeSelectionModel.fireValueChanged(Unknown Source)
at javax.swing.tree.DefaultTreeSelectionModel.notifyPathChange(Unknown Source)
at javax.swing.tree.DefaultTreeSelectionModel.setSelectionPaths(Unknown Source)
at javax.swing.tree.DefaultTreeSelectionModel.setSelectionPath(Unknown Source)
at javax.swing.JTree.setSelectionPath(Unknown Source)
at com.eviware.soapui.ui.Navigator.selectModelItem(Navigator.java:198)
at com.eviware.soapui.SoapUI.buildUI(SoapUI.java:264)
at com.eviware.soapui.SoapUI.show(SoapUI.java:926)
at com.eviware.soapui.SoapUI.startSoapUI(SoapUI.java:789)
at com.eviware.soapui.SoapUI$SoapUIRunner.run(SoapUI.java:624)
at com.eviware.soapui.SoapUI.main(SoapUI.java:720)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.exe4j.runtime.LauncherEngine.launch(Unknown Source)
at com.exe4j.runtime.WinLauncher.main(Unknown Source)
Please help to resolve this. Thanks,