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problem in cewolf image generatoin  RSS feed

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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(
at javax.servlet.http.HttpServlet.service(
at javax.servlet.http.HttpServlet.service(
at com.iplanet.server.http.servlet.NSServletRunner.invokeServletService(
at com.iplanet.server.http.servlet.NSServletRunner.Service(
What is the cause of this error ?
Thanks in advance.
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