为什么不能查阅电子样本?

请问，我想查阅电子样本，却不可以，为什么?
而且，会出现以下提示:
500 Servlet Exception
java.sql.SQLException: Error: executeQueryForObject returned too many results.
at com.ibatis.sqlmap.engine.mapping.statement.GeneralStatement.executeQueryForObject(GeneralStatement.java:103)
at com.ibatis.sqlmap.engine.impl.SqlMapExecutorDelegate.queryForObject(SqlMapExecutorDelegate.java:348)
at com.ibatis.sqlmap.engine.impl.SqlMapExecutorDelegate.queryForObject(SqlMapExecutorDelegate.java:333)
at com.ibatis.sqlmap.engine.impl.SqlMapSessionImpl.queryForObject(SqlMapSessionImpl.java:82)
at com.ibatis.sqlmap.engine.impl.SqlMapClientImpl.queryForObject(SqlMapClientImpl.java:57)
at com.ibatis.dao.client.template.SqlMapDaoTemplate.queryForObject(SqlMapDaoTemplate.java:162)
at com.netease.neteaseivp.ebook.persistence.dao.ibatis.AuthDaoImpl.getAuthInfo(AuthDaoImpl.java:24)
at sun.reflect.GeneratedMethodAccessor42.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at com.ibatis.dao.engine.impl.DaoProxy.invoke(DaoProxy.java:72)
at $Proxy6.getAuthInfo(Unknown Source)
at com.netease.neteaseivp.ebook.service.ServiceDelegate.getAuthInfo(ServiceDelegate.java:520)
at _jsp._ebook._auth_0forward__jsp._jspService(/ebook/auth_forward.jsp:21)
at com.caucho.jsp.JavaPage.service(JavaPage.java:61)
at com.caucho.jsp.Page.pageservice(Page.java:557)
at com.caucho.server.dispatch.PageFilterChain.doFilter(PageFilterChain.java:141)
at com.caucho.server.webapp.DispatchFilterChain.doFilter(DispatchFilterChain.java:115)
at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:207)
at com.caucho.server.webapp.RequestDispatcherImpl.forward(RequestDispatcherImpl.java:262)
at com.caucho.server.webapp.RequestDispatcherImpl.forward(RequestDispatcherImpl.java:100)
at _jsp._ebook._openEBookInterceptor__jsp._jspService(_openEBookInterceptor__jsp.java:43)
at com.caucho.jsp.JavaPage.service(JavaPage.java:61)
at com.caucho.jsp.Page.pageservice(Page.java:557)
at com.caucho.server.dispatch.PageFilterChain.doFilter(PageFilterChain.java:141)
at com.caucho.server.cache.CacheFilterChain.doFilter(CacheFilterChain.java:220)
at com.caucho.server.webapp.WebAppFilterChain.doFilter(WebAppFilterChain.java:163)
at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:207)
at com.caucho.server.hmux.HmuxRequest.handleRequest(HmuxRequest.java:385)
at com.caucho.server.port.TcpConnection.run(TcpConnection.java:327)
at com.caucho.util.ThreadPool.runTasks(ThreadPool.java:450)
at com.caucho.util.ThreadPool.run(ThreadPool.java:394)
at java.lang.Thread.run(Thread.java:534)


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Resin Professional 3.0.9 (built Wed, 13 Oct 2004 03:02:16 PDT)

不明白呀。请高手解决。