GWT ClasscastException when casting from java.lang.String(json) to com.google.gwt.core.client.JavascriptObject

We are working with the Web application which was developed by using GWT and smart gwt project. Currently we are using

GWT-2.5.1 and smart gwt-5.0 in our application.Now we wanted to upgrade our smart gwt upgrade to 6.1 from 5.0 but not changed the GWT. 

We got the compilation error with smart-gwt-6.1 with GWT-2.5.0. So we also migrated GWT to 2.6.1. Now we are able to compile our application successfuly.

We have got the runtime exception like below.

   

     public void transformResponse(Object data) { // data contains json string

        JavaScriptObject jsObj = (JavascriptObject) data.// This line causes the below excepton

        }

        

        ClassCastExcetion: java.lang.Strig can not cast to com.google.gwt.core.cient.Javascript Object.

This code was working with the earlier versions of smart-gwt and GWT. but now it is throwing this exception.

Firstly I was not be able to find any documentation about compatability of smart-gwt and gwt. 

Could any body tell me how to solve the above issue and how to handle this upgrade of smart gwt. 

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