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problem in cewolf image generatoin  RSS feed

durga xxx
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I'm using cewolf to display charts in JSP file ( webserver:iPlanet6.0sp2 )
When i'm trying to change the param values & want to generate new chart image, sometimes image is not generated. It gives the error :
de.laures.cewolf.ConfigurationException: no image found under key '13'.
at de.laures.cewolf.CewolfRenderer.doGet(CewolfRenderer.java:114)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at com.iplanet.server.http.servlet.NSServletRunner.invokeServletService(NSServletRunner.java:897)
at com.iplanet.server.http.servlet.NSServletRunner.Service(NSServletRunner.java:464)
What is the cause of this error ?
Thanks in advance.
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