I am using DisplayTag1.1 in Portal6.0 for export feature and I get exception "Unable to reset response before returning exported data. You are not using an export filter. Be sure that no other jsp tags are used before display:table or refer to the display. I have configured the export filter in web.xml as follows

 <filter>
    <filter-name>ResponseOverrideFilter</filter-name>
    <filter-class>org.displaytag.filter.ResponseOverrideFilter</filter-class>
    </filter>
    <filter-mapping>
<filter-name>ResponseOverrideFilter</filter-name>
  <url-pattern>/*</url-pattern>
  </filter-mapping>
    <filter-mapping>
     <filter-name>ResponseOverrideFilter</filter-name>
     <url-pattern>*.do</url-pattern>
    </filter-mapping>
  <filter-mapping>
<filter-name>ResponseOverrideFilter</filter-name>
  <url-pattern>*.jsp</url-pattern>
  </filter-mapping>
I still get the error as mentioned above