Primefaces 2.1 JSF2 Spring

[QuestionMark]

My App gave the following error

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javax.faces.FacesException: java.lang.NoSuchMethodError: org.primefaces.component.chart.series.ChartSeries.getStateHelper()Ljavax/faces/component/StateHelper;
	javax.faces.component.UIComponentBase$AttributesMap.put(UIComponentBase.java:1600)
	javax.faces.component.UIComponentBase$AttributesMap.put(UIComponentBase.java:1499)
	javax.faces.component.UIComponent.setValueExpression(UIComponent.java:251)
	org.primefaces.component.chart.series.ChartSeriesTag.setProperties(ChartSeriesTag.java:53)
	javax.faces.webapp.UIComponentELTag.createComponent(UIComponentELTag.java:219)
	javax.faces.webapp.UIComponentClassicTagBase.createChild(UIComponentClassicTagBase.java:476)
	javax.faces.webapp.UIComponentClassicTagBase.findComponent(UIComponentClassicTagBase.java:660)
	javax.faces.webapp.UIComponentClassicTagBase.doStartTag(UIComponentClassicTagBase.java:1111)
	org.apache.jsp.jsp.LineChart1_jsp._jspx_meth_p_005fchartSeries_005f0(LineChart1_jsp.java:260)
	org.apache.jsp.jsp.LineChart1_jsp._jspx_meth_p_005fstackedColumnChart_005f0(LineChart1_jsp.java:221)
	org.apache.jsp.jsp.LineChart1_jsp._jspx_meth_h_005fform_005f0(LineChart1_jsp.java:167)
	org.apache.jsp.jsp.LineChart1_jsp._jspx_meth_f_005fview_005f0(LineChart1_jsp.java:116)
	org.apache.jsp.jsp.LineChart1_jsp._jspService(LineChart1_jsp.java:74)
	org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
	org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:373)
	org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:336)
	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
	com.sun.faces.context.ExternalContextImpl.dispatch(ExternalContextImpl.java:408)
	com.sun.faces.application.ViewHandlerImpl.executePageToBuildView(ViewHandlerImpl.java:442)
	com.sun.faces.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:115)
	com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:106)
	com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:251)
	com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:144)
	javax.faces.webapp.FacesServlet.service(FacesServlet.java:245)
	org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)

I am using Primefaces2, JSF mojarra 2.0 and Spring in my project. I got this error while trying to run simple LineChart page, the code is as mentioned in the userguide. I get this error at the jsp code line

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<p:chartSeries label="Boys" value="#{birth.boys}" ></p:chartSeries>
									<p:chartSeries label="Girls" value="#{birth.girls}" ></p:chartSeries>								

Thanks in advance.