HTTP Status 500

i have a 10 interface version of this product.
When I click on an interface to see the traffic flows I get the following error.
I have tried to restart the server and to restart the services.

HTTP Status 500 -

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type Exception report

message

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

exception

java.lang.IllegalArgumentException: DateAxis.setRange(...): lower not before upper.
org.jfree.chart.axis.DateAxis.setRange(DateAxis.java:457)
com.adventnet.netflow.beans.ReportDetailsBean.generateGraphTimeSeries(ReportDetailsBean.java:403)
com.adventnet.netflow.beans.ReportDetailsBean.getGraphPageResults(ReportDetailsBean.java:124)
org.apache.jsp.jspui.traffic_jsp._jspService(traffic_jsp.java:462)
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.

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Apache Tomcat/5.0.28