.getRequestDispatcher("/").forward question

I am not sure why I am getting this error.
java.lang.IllegalStateException at org.apache.catalina.connector.ResponseFacade.getWriter(ResponseFacade.java:159)
from the code.
this.getServletConfig().getServletContext().getRequestDispatcher("/").forward(request,response);
Can anyone help? Has anyone seen this before ?
I am not calling getOutputStream manually on the same request.

Typically an IllegalStateException in a case like this is because something has already been written to the response. For example,
if the response state was set, if a writer was retrieved, etc.
Look for these and see if one of them is the problem.

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    Solved!
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