unable to use external javascript in GWT

Hi ,

I want to use goJS with GWT. I downloaded GOJS javascript and put it in the sampleproject folder under war where sampleproject.nocache.js and sampleproject.devmode.js is present. In sampleproject.html i added 

<script type="text/javascript" language="javascript" src="sampleproject/go.js"></script>

In one of the view i used 

public static native void initGo() /*-{

var $$ = go.GraphObject.make;

}-*/;

when i call this function , exception is thrown:

com.google.gwt.event.shared.UmbrellaException: Exception caught: (ReferenceError) @com.amazon.ops.client.OpsMenuView::initGo()([]): go is not defined.

Can anyone please help me with this?

thanks,

sandeep

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