Petals Web-Console

java.lang.NullPointerException:    org.ow2.petals.tools.webconsole.uibeans.MonitoringUIBean.getExchangesCount(MonitoringUIBean.java:1685)
    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    java.lang.reflect.Method.invoke(Method.java:597)
    org.ow2.opensuit.cel.impl.tree.impl.ast.AstInvocation.invoke(AstInvocation.java:146)
    org.ow2.opensuit.cel.impl.tree.impl.ast.AstMethod.invoke(AstMethod.java:136)
    org.ow2.opensuit.cel.impl.tree.impl.ast.AstEval.invoke(AstEval.java:59)
    org.ow2.opensuit.core.expression.ExpressionUtils.invokeExpression(ExpressionUtils.java:119)
    org.ow2.opensuit.xml.base.binding.Expression.invoke(Expression.java:147)
    org.ow2.opensuit.xml.chart.XYChart.makePlot(XYChart.java:183)
    org.ow2.opensuit.xml.chart.BaseChart.getData(BaseChart.java:346)
    org.ow2.opensuit.xml.chart.BaseChart.render(BaseChart.java:196)
    org.ow2.opensuit.xml.base.html.layout.Div.render(Div.java:110)
    org.ow2.opensuit.xml.base.page.Composite.render(Composite.java:56)
    org.ow2.opensuit.xml.base.html.PageContainer.render(PageContainer.java:76)
    org.ow2.opensuit.xml.base.html.layout.Div.render(Div.java:110)
    org.ow2.opensuit.xml.base.html.layout.Div.render(Div.java:110)
    org.ow2.opensuit.xml.base.html.Frame.render(Frame.java:93)
    org.ow2.opensuit.xml.base.page.BasePage.servePage(BasePage.java:241)
    org.ow2.opensuit.xml.base.Application.service(Application.java:553)
    org.ow2.opensuit.core.impl.j2ee.OpenSuitServlet.service(OpenSuitServlet.java:155)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
    org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
    org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
    org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
    org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
    org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
    org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:857)
    org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
    org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
    java.lang.Thread.run(Thread.java:619)