请教各位：我架设的jive论坛在发新帖处出错：java.lang.NullPointerException
at org.apache.jsp.post_jsp._jspService(post_jsp.java:210)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:137)
at javax.servlet.http.HttpServlet.service
......
不知如何更正。谢谢高手指教！