500 Servlet Exception

java.lang.NullPointerException
	at cnifw.wlzh_date_count.count(wlzh_date_count.java:71)
	at _jsp._wlzh._lxwm_0wlzh__jsp._jspService(wlzh/lxwm_wlzh.jsp:11)
	at com.caucho.jsp.JavaPage.service(JavaPage.java:60)
	at com.caucho.jsp.Page.pageservice(Page.java:570)
	at com.caucho.server.dispatch.PageFilterChain.doFilter(PageFilterChain.java:175)
	at com.caucho.server.webapp.WebAppFilterChain.doFilter(WebAppFilterChain.java:178)
	at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:229)
	at com.caucho.server.http.HttpRequest.handleRequest(HttpRequest.java:268)
	at com.caucho.server.port.TcpConnection.run(TcpConnection.java:389)
	at com.caucho.util.ThreadPool.runTasks(ThreadPool.java:507)
	at com.caucho.util.ThreadPool.run(ThreadPool.java:433)
	at java.lang.Thread.run(Thread.java:595)

Resin-3.0.19 (built Fri, 21 Jul 2006 03:52:09 PDT)