Dear Members,
I have one problem in gwt-ext, first i created one tree and five five
branches, clicking on these branches  it does not show new pages
directly after this i need to refresh the page then its show the new
pages.
give me suggestion how do i solve our problem , error shows


[ERROR] Unable to load module entry point class
com.wms.client.BlueMarble (see associated exception for details)
com.google.gwt.core.client.JavaScriptException: (TypeError): 'null' is
null or not an object
 number: -2146823281
 description: 'null' is null or not an object
       at com.gwtext.client.widgets.Viewport.doLayout(Native Method)
       at com.gwtext.client.widgets.Viewport.<init>(Viewport.java:64)
       at com.wms.client.BlueMarble.onModuleLoad(BlueMarble.java:41)

give me your valuable suggesion..
thanking you.
bye
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