您能帮我调试Liferay Portal中出现的以下异常吗？
URL / c / portal / layout
java.lang.NullPointerException /com.liferay.portlet.assetpublisher.action.ViewAction
…che.catalina.core.ApplicationHttpRequest.getRequestURL (ApplicationHttpRequest.java:490)
…x.servlet.http.HttpServletRequestWrapper.getRequestURL (HttpServletRequestWrapper.java:211)
…x.servlet.http.HttpServletRequestWrapper.getRequestURL (HttpServletRequestWrapper.java:211)
com.liferay.portal.util.HttpImpl.getCompleteURL (HttpImpl.java:382)
com.liferay.portal.kernel.util.HttpUtil.getCompleteURL (HttpUtil.java:102)
com.liferay.portal.util.PortalImpl.getCurrentURL (PortalImpl.java:1797)
com.liferay.portal.util.PortalUtil.getCurrentURL (PortalUtil.java:472)
com.liferay.portlet.PortletURLUtil.getRefreshURL (PortletURLUtil.java:256)
com.liferay.portlet.PortletURLUtil.getRefreshURL (PortletURLUtil.java:167)
…che.jsp.html.portal.render_005fportlet_jsp._jspService (render_005fportlet_jsp.java:1694)
org.apache.jasper.runtime.HttpJspBase.service (HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service (HttpServlet.java:731)
…liferay.portal.servlet.DirectRequestDispatcher.include (DirectRequestDispatcher.java:57)
…servlet.ClassLoaderRequestDispatcherWrapper.doDispatch (ClassLoaderRequestDispatcherWrapper.java:78)
…al.servlet.ClassLoaderRequestDispatcherWrapper.include (ClassLoaderRequestDispatcherWrapper.java:53)
com.liferay.portlet.PortletContainerImpl._doRender (PortletContainerImpl.java:638)
com.liferay.portlet.PortletContainerImpl.render (PortletContainerImpl.java:135)
…liferay.portlet.SecurityPortletContainerWrapper.render (SecurityPortletContainerWrapper.java:141)
…liferay.portlet.RestrictPortletContainerWrapper.render (RestrictPortletContainerWrapper.java:126)
…eray.portal.kernel.portlet.PortletContainerUtil.render (PortletContainerUtil.java:156)
…ortal.layoutconfiguration.util.PortletRenderer._render (PortletRenderer.java:125)
…rtal.layoutconfiguration.util.PortletRenderer.access$4 (PortletRenderer.java:107)
…on.util.PortletRenderer$PortletRendererCallable.doCall (PortletRenderer.java:180)
…on.util.PortletRenderer$PortletRendererCallable.doCall (PortletRenderer.java:1)
…ay.portal.kernel.executor.CopyThreadLocalCallable.call (CopyThreadLocalCallable.java:69)
java.util.concurrent.FutureTask.run (FutureTask.java:262)
…rnel.concurrent.ThreadPoolExecutor$WorkerTask._runTask (ThreadPoolExecutor.java:682)
…al.kernel.concurrent.ThreadPoolExecutor$WorkerTask.run (ThreadPoolExecutor.java:593)
java.lang.Thread.run (Thread.java:745)
我正在运行Liferay Portal Enterprise Edition 6.2.10 EE GA1。有任何线索吗？
最诚挚的问候，
FabrícioSperandio