I am using Netbeans 6.1 and ajax4jsf1.1.1 and i am getting

NullPointerExcepton:

Caused by: java.lang.NullPointerException
at org.ajax4jsf.framework.renderer.AjaxRendererUtils.buildAjaxFunction(AjaxRendererUtils.java:368)
at org.ajax4jsf.framework.renderer.AjaxRendererUtils.buildAjaxFunction(AjaxRendererUtils.java:347)
at org.ajax4jsf.framework.renderer.AjaxRendererUtils.buildOnEvent(AjaxRendererUtils.java:156)
at org.ajax4jsf.ajax.UIAjaxSupport.getEventString(UIAjaxSupport.java:115)
at org.ajax4jsf.framework.ajax.EventValueBinding.getValue(EventValueBinding.java:92)
at javax.faces.component.ValueExpressionValueBindingAdapter.getValue(ValueExpressionValueBindingAdapter.java:73)


Jsp Code:

<h:selectOneMenu id="makeid" value="#{common$modelSelectionPage.selectedMake}" >
<f:selectItem itemLabel="-Select Make-" itemValue=""></f:selectItem>
<f:selectItems value="#{common$modelSelectionPage.makeList}"></f:selectItems>

<a:support event="onchange" reRender="modelid,yearid" id="renderMake"
action="#{common$modelSelectionPage.onChangeMake}" />
</h:selectOneMenu>

Could any one please help me out to solve this issue?