Just installed...HTTP Status 500

I just installed the eval and while I can run reports and I get correct looking data whenever I click on an interface in the dashboard I get the following error:

HTTP Status 500 -

type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

javax.servlet.ServletException
org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:825)
org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:758)
org.apache.jsp.jspui.traffic_jsp._jspService(traffic_jsp.java:1751)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
com.adventnet.netflow.utils.EncodingFilter.doFilter(EncodingFilter.java:45)

root cause

java.lang.NoClassDefFoundError
com.adventnet.netflow.beans.ReportDetailsBean.generateGraphTimeSeries(ReportDetailsBean.java:414)
com.adventnet.netflow.beans.ReportDetailsBean.getGraphPageResults(ReportDetailsBean.java:125)
org.apache.jsp.jspui.traffic_jsp._jspService(traffic_jsp.java:493)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
com.adventnet.netflow.utils.EncodingFilter.doFilter(EncodingFilter.java:45)

note The full stack trace of the root cause is available in the Apache Tomcat/5.0.28 logs.
Apache Tomcat/5.0.28

Also I see the following in my /var/log/httpd/error_log:

[Mon Apr 10 15:03:14 2006] [error] [client 172.16.10.114] File does not exist: /var/www/html/favicon.ico
[Mon Apr 10 15:03:14 2006] [error] [client 172.16.10.114] File does not exist: /var/www/html/favicon.ico
[Mon Apr 10 15:08:14 2006] [error] [client 172.16.10.114] File does not exist: /var/www/html/favicon.ico
[Mon Apr 10 15:08:14 2006] [error] [client 172.16.10.114] File does not exist: /var/www/html/favicon.ico
[Mon Apr 10 15:44:59 2006] [error] [client 127.0.0.1] File does not exist: /var/www/html/netflow
[Mon Apr 10 15:45:00 2006] [error] [client 127.0.0.1] File does not exist: /var/www/html/netflow
[Mon Apr 10 15:45:00 2006] [error] [client 127.0.0.1] File does not exist: /var/www/html/netflow
[Mon Apr 10 15:45:00 2006] [error] [client 127.0.0.1] File does not exist: /var/www/html/netflow
[Mon Apr 10 15:45:01 2006] [error] [client 127.0.0.1] File does not exist: /var/www/html/netflow
[Mon Apr 10 15:45:01 2006] [error] [client 127.0.0.1] File does not exist: /var/www/html/netflow

I'm new so be gentle...