First of all , thanks for appreciating the work .. Yes , the reason you are getting error is that Jasperserver 3.7.1 version does not have library to supprot spider chart which is in iRepprt 3.7.6 But , Jasperserver 4.0 [ which will be released soon ..in 2-3 weeks ] and Jasperserver pro 4.0 which is already released , for sure have support for spider chart it should work perfect thanks Ramnik Kaur Senior QA Engineer