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Uncaught TypeError: Cannot read property 'delayedCall' of undefined

Hi experts,

   I created a simple view , in which I have included a Application header. Now whenever I click logoff button I defined a event handler in controller of the view.  The event handler simply displays an alert .For this I used sap.ui.commons.MessageBox.alert. Sadly, it doesnt show the message and below error is generated in the console

I event tried to mention the"sap.ui.commons.MessageBox"); statement before controller definition starts



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