Ajax suddenly not working

i got this error in my console.and suddenly the selectOneMenu did not fire any listener when the value changes.im using primefaces-3.0.M2.jar.

    Unhandled by MetaTagHandler for type org.primefaces.component.behavior.ajax.AjaxBehavior

and this is my code in .xhtml file

    <p:ajax actionListener="#{innovationManager.innovationArea开发者_开发百科Listener}" event="change" update="frmInnovation" />

anyone got any clue about this?

The <p:ajax> tag does not support the actionListener attribute. It should have been listener.

<p:ajax listener="#{innovationManager.innovationAreaListener}" event="change" update="frmInnovation" />

I wonder if you didn't omit some parts of the error message. The hint about the actionListener attribute should have been included in the exception message.