Does anyone here use the Cewolf API?

I am in the middle of a project where I have to display a linear graph chart which presents the results from a simulation. After som searching I decided to use Cewolf (Chart Enabling Web Object Framework).
http://cewolf.sourceforge.net/new/index.html
Now, I went through the tutorial step by step to make sure I did everything right, but then when it was time to view the results, the jsp page is displayed, but the image doesn't/is blank.
My JSP:
<%@page contentType="text/html"%>
<%@page pageEncoding="UTF-8"%>
<%@taglib uri='/WEB-INF/cewolf.tld' prefix='cewolf' %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
     <head>
     <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
     <link rel="stylesheet" type="text/css" href="themes/default/stylesheet.css" />
     <title>JSP Page</title>
     </head>
     <body>
     <%@ include file="includes/Header.jsp" %>
     <%@ include file="includes/NavOnline.jsp" %>
     <div id="content">
               <jsp:useBean id="pageViews" class="hovedprosjekt.pages.GraphData"/>
               <cewolf:chart
                    id="line"
                    title="Page View Statistics"
                    type="line"
                    xaxislabel="Page"
                    yaxislabel="Views">
               <cewolf:data>
                    <cewolf:producer id="pageViews"/>
               </cewolf:data>
               </cewolf:chart>
               <p>
                    <cewolf:img chartid="line" renderer="cewolf" width="400" height="300"/>
               </p>
     </div>
     <%@ include file="includes/Footer.jsp" %>
     </body>
</html>
I use Netbeats IDE 5.5 to run my project, if that's any help... I just can't see what it is that I'm doing wrong here

Ok, I moved my JSP page down to the root folder and finally got in touch with Cewolf. But now I've encountered a new problem. I get a long error message instead of a graph:
I took a screenshot and put it up here:
http://www.geocities.com/gmb_loves_angel/JSPError.html
java.lang.NoSuchMethodError
Again, I only used the code example that was provided in the tutorial and it is simply not working... help

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