java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.View android.support.v4.widget.DrawerLayout.findViewById(int)' on a null object reference

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Attempt to invoke virtual method 'android.view.View android.support.v4.widget.DrawerLayout.findViewById(int)' on a null object reference
java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.View android.support.v4.widget.DrawerLayout.findViewById(int)' on a null object reference
at com.gedroid.ilprimo3.WebAppInterface.openMenu(WebAppInterface.java:95)
at org.chromium.base.SystemMessageHandler.nativeDoRunLoopOnce(Native Method)
at org.chromium.base.SystemMessageHandler.handleMessage(SystemMessageHandler.java:53)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.os.HandlerThread.run(HandlerThread.java:61)

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