Problema HTTP Status 500 -

Pessoal,

Estou tentando apreender a linguagem, estou em uma pós em java da estacio

ja percebi que não e erro de codigo.

HTTP Status 500 -

type Exception report

message

description The server encountered an internal error that prevented it from fulfilling this request.

exception

javax.servlet.ServletException
javax.faces.webapp.FacesServlet.service(Unknown Source)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

root cause

java.lang.NullPointerException
org.primefaces.renderkit.OutcomeTargetRenderer.getTargetURL(OutcomeTargetRenderer.java:80)
org.primefaces.component.menu.BaseMenuRenderer.encodeMenuItem(BaseMenuRenderer.java:148)
org.primefaces.component.tieredmenu.TieredMenuRenderer.encodeElements(TieredMenuRenderer.java:103)
org.primefaces.component.tieredmenu.TieredMenuRenderer.encodeSubmenu(TieredMenuRenderer.java:162)
org.primefaces.component.tieredmenu.TieredMenuRenderer.encodeElements(TieredMenuRenderer.java:119)
org.primefaces.component.tieredmenu.TieredMenuRenderer.encodeMenu(TieredMenuRenderer.java:78)
org.primefaces.component.menubar.MenubarRenderer.encodeMarkup(MenubarRenderer.java:49)
org.primefaces.component.menu.BaseMenuRenderer.encodeEnd(BaseMenuRenderer.java:105)
javax.faces.component.UIComponentBase.encodeEnd(Unknown Source)
javax.faces.component.UIComponent.encodeAll(Unknown Source)
javax.faces.render.Renderer.encodeChildren(Unknown Source)
javax.faces.component.UIComponentBase.encodeChildren(Unknown Source)
org.primefaces.renderkit.CoreRenderer.renderChild(CoreRenderer.java:70)
org.primefaces.renderkit.CoreRenderer.renderChildren(CoreRenderer.java:57)
org.primefaces.component.layout.LayoutUnitRenderer.encodeEnd(LayoutUnitRenderer.java:51)
javax.faces.component.UIComponentBase.encodeEnd(Unknown Source)
javax.faces.component.UIComponent.encodeAll(Unknown Source)
javax.faces.component.UIComponent.encodeAll(Unknown Source)
javax.faces.component.UIComponent.encodeAll(Unknown Source)
javax.faces.component.UIComponent.encodeAll(Unknown Source)
com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(Unknown Source)
com.sun.faces.application.view.MultiViewHandler.renderView(Unknown Source)
com.sun.faces.lifecycle.RenderResponsePhase.execute(Unknown Source)
com.sun.faces.lifecycle.Phase.doPhase(Unknown Source)
com.sun.faces.lifecycle.LifecycleImpl.render(Unknown Source)
javax.faces.webapp.FacesServlet.service(Unknown Source)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

note The full stack trace of the root cause is available in the Apache Tomcat/7.0.69 logs.
Apache Tomcat/7.0.69