Hi guys.... I'm new in this topic and I trying to do a simple commandButton that use ajax4jsf for rendering a panelGrid, but it doesn't work....

My page is:

<f:view>
<a4f:page>
<h:form>
<h:panelGrid id="frameGeneral">
<h:panelGrid id="OpcOperacion" columns="2">
<h:commandButton value="Venta">
<a4f:support reRender="panelVenta,
panelReporte" immediate="true" event="onclick"
actionListener="#{initBean.activarVentas}"/>
</h:commandButton>
<h:commandButton value="Reporte">
<a4f:support reRender="panelVenta,
panelReporte" immediate="true" event="onclick"
actionListener="#{initBean.activarReportes}"/>
</h:commandButton>
</h:panelGrid>
<h:panelGrid id="frameInterno">
<h:panelGrid id="panelVenta"
rendered="#{initBean.renderVentas}">
<h:commandButton value="VENTAS"
id="botonVentas"></h:commandButton>
</h:panelGrid>
<h:panelGrid id="panelReporte"
rendered="#{initBean.renderReportes}">
<h:commandButton value="REPORTES"
id="botonReporte"></h:commandButton>
</h:panelGrid>
</h:panelGrid>
</h:panelGrid>
</h:form>
</a4f:page>
</f:view>

the initBean.activarReportes and initBean.activarVentas actionListeners only change a boolean attribute (renderVentas = true)

When I run the page and I do click in the buttons, they show a popup with the message: "Request Error Status: 500 Internal Server Error. Message: undefined" and throws an exception : org.apache.jasper.JasperException: javax.servlet.jsp.JspException: Duplicate component ID '_id0' found in view.

I dont know what is bad.... Can Anybody HELP ME?????