Alex - 2006-09-20

I'm in a project with Jsp and Cewolf and I have to present some step charts but I always get an error message :

SEVERE: CewolfServlet: unsupported chart type step
java.lang.RuntimeException: unsupported chart type step
        at de.laures.cewolf.taglib.CewolfChartFactory.getChartTypeConstant(CewolfChartFactory.java:104)
        at de.laures.cewolf.taglib.CewolfChartFactory.getChartInstance(CewolfChartFactory.java:131)
        at de.laures.cewolf.taglib.SimpleChartDefinition.produceChart(SimpleChartDefinition.java:30)
        at de.laures.cewolf.taglib.AbstractChartDefinition.getChart(AbstractChartDefinition.java:121)
        at de.laures.cewolf.taglib.ChartImageDefinition.ensureRendered(ChartImageDefinition.java:137)
        at de.laures.cewolf.taglib.ChartImageDefinition.getSize(ChartImageDefinition.java:146)
        at de.laures.cewolf.CewolfRenderer.doGet(CewolfRenderer.java:153)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
        at com.opensymphony.webwork.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:177)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
        at org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:362)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
        at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:407)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
        at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:856)
        at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:744)
        at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
        at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
        at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
        at java.lang.Thread.run(Thread.java:595)

Can anyone tell me what I'm doing wrong or show me an example?

Thanks in advance.