500 Servlet Exception

java.sql.SQLException: Column not found message from server: "Unknown column
'exdate' in 'field list'"
	at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:1997)
	at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1167)
	at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:1278)
	at com.mysql.jdbc.MysqlIO.sqlQuery(MysqlIO.java:1224)
	at com.mysql.jdbc.Connection.execSQL(Connection.java:2244)
	at com.mysql.jdbc.Connection.execSQL(Connection.java:2192)
	at com.mysql.jdbc.Statement.executeQuery(Statement.java:1163)
	at _chengji._index__jsp.getListfromDBWithConn(/chengji/./admin/db.jsp:35)
	at _chengji._index__jsp._jspService(D:\resin平台\resin\resin-2.1.16\doc\xxzx\chengji\index.jsp:32)
	at com.caucho.jsp.JavaPage.service(JavaPage.java:75)
	at com.caucho.jsp.Page.subservice(Page.java:506)
	at com.caucho.server.http.FilterChainPage.doFilter(FilterChainPage.java:182)
	at com.caucho.server.http.Invocation.service(Invocation.java:315)
	at com.caucho.server.http.CacheInvocation.service(CacheInvocation.java:135)
	at com.caucho.server.http.HttpRequest.handleRequest(HttpRequest.java:253)
	at com.caucho.server.http.HttpRequest.handleConnection(HttpRequest.java:171)
	at com.caucho.server.TcpConnection.run(TcpConnection.java:139)
	at java.lang.Thread.run(Unknown Source)
有时总出现这个问题啊，不知道找原因啊