急问：JDeveloper开发报表的有关问题

急问：JDeveloper开发报表的问题
我用JDeveloper10g创建了一个Report JSP，然后用ReportBuilder编辑了报表内容
但在运行这个JSP时，弹出网页报错
javax.servlet.jsp.JspException: REP-51002: ??? Reports Server reportserver ?? 
javax.servlet.jsp.JspException: REP-51002: ??? Reports Server reportserver ??
at oracle.reports.jsp.ReportTag.doStartTag(ReportTag.java:433)
at _MyReport._jspService(MyReport.jsp:5)
at oracle.jsp.runtime.HttpJsp.service(HttpJsp.java:139)
at oracle.jsp.runtimev2.JspPageTable.service(JspPageTable.java:350)
at oracle.jsp.runtimev2.JspServlet.internalService(JspServlet.java:509)
at oracle.jsp.runtimev2.JspServlet.service(JspServlet.java:413)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at com.evermind.server.http.ServletRequestDispatcher.invoke(ServletRequestDispatcher.java:837)
at com.evermind.server.http.ServletRequestDispatcher.forwardInternal(ServletRequestDispatcher.java:330)
at com.evermind.server.http.HttpRequestHandler.processRequest(HttpRequestHandler.java:830)
at com.evermind.server.http.HttpRequestHandler.run(HttpRequestHandler.java:285)
at com.evermind.server.http.HttpRequestHandler.run(HttpRequestHandler.java:126)
at com.evermind.util.ReleasableResourcePooledExecutor$MyWorker.run(ReleasableResourcePooledExecutor.java:192)
at java.lang.Thread.run(Thread.java:534)

是不是report builder需要做一些配置啊？这个是和JDeveloper一起装的
请教高手，多谢！

------解决方案--------------------
创建个rwserver就可以了