help me out

Dear Supporter,

Am getting this error when am trying to do the refresh the page or go back to request tab.

FYA

HTTP Status 500 -

type Exception report

message

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

exception

java.lang.NullPointerException
	java.util.Hashtable.put(Unknown Source)
	com.adventnet.servicedesk.home.util.LicenseReminderUtil.getDetails(LicenseReminderUtil.java:88)
	org.apache.jsp.jsp.HomePage_jsp._jspService(HomePage_jsp.java:1491)
	org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
	com.adventnet.servicedesk.filter.EncodingFilter.doFilter(EncodingFilter.java:196)
	org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1069)
	org.apache.struts.tiles.TilesRequestProcessor.doForward(TilesRequestProcessor.java:274)
	org.apache.struts.action.RequestProcessor.processForwardConfig(RequestProcessor.java:455)
	org.apache.struts.tiles.TilesRequestProcessor.processForwardConfig(TilesRequestProcessor.java:320)
	org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:279)
	org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
	org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:507)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:697)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
	com.manageengine.servicedesk.common.filter.ResetThreadLocal.doFilter(ResetThreadLocal.java:26)
	com.adventnet.servicedesk.filter.EncodingFilter.doFilter(EncodingFilter.java:196)
	org.tuckey.web.filters.urlrewrite.UrlRewriteFilter.doFilter(UrlRewriteFilter.java:350)
	com.adventnet.servicedesk.authentication.NTLMV2CredentialAssociationFilter.doFilter(NTLMV2CredentialAssociationFilter.java:34)
	com.adventnet.servicedesk.authentication.NTLMV2Filter.doFilter(NTLMV2Filter.java:178)
	org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:75)