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500 Servlet Exception

java.lang.NullPointerException
	at com.icxo.project.conn.conn.executeQuery(conn.java:175)
	at com.icxo.project.cooperate.see_cooperate.list_page(see_cooperate.java:278)
	at _jsp._project._cooperate_03__jsp._jspService(project/cooperate_3.jsp:407)
	at com.caucho.jsp.JavaPage.service(JavaPage.java:61)
	at com.caucho.jsp.Page.pageservice(Page.java:577)
	at com.caucho.server.dispatch.PageFilterChain.doFilter(PageFilterChain.java:190)
	at com.caucho.server.webapp.WebAppFilterChain.doFilter(WebAppFilterChain.java:167)
	at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:226)
	at com.caucho.server.http.HttpRequest.handleRequest(HttpRequest.java:263)
	at com.caucho.server.port.TcpConnection.run(TcpConnection.java:477)
	at com.caucho.util.ThreadPool$Item.runTasks(ThreadPool.java:591)
	at com.caucho.util.ThreadPool$Item.run(ThreadPool.java:513)
	at java.lang.Thread.run(Thread.java:595)