请教，oracle web界面登陆报错，什么原因引起的？求高人指点

报下边的错，我google了一下，好像是应用服务器有问题，不知如何下手啊

JSP Error:

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Request URI:/OA_HTML/OA.jsp



Exception:
java.lang.NoClassDefFoundError: oracle/apps/fnd/framework/server/common/OAApplicationModule
        at java.lang.ClassLoader.defineClass0(Native Method)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:48
        at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:106)
        at java.net.URLClassLoader.defineClass(URLClassLoader.java:243)
        at java.net.URLClassLoader.access$100(URLClassLoader.java:51)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:190)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:183)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:294)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:28
        at java.lang.ClassLoader.loadClass(ClassLoader.java:250)
        at oracle.jbo.common.java2.JDK2ClassLoader.loadClassForName(JDK2ClassLoader.java:35)
        at oracle.jbo.common.JBOClass.forName(JBOClass.java:139)
        at oracle.jbo.server.ApplicationModuleDefImpl.loadFromXML(ApplicationModuleDefImpl.java:581)
        at oracle.jbo.server.ApplicationModuleDefImpl.loadFromXML(ApplicationModuleDefImpl.java:52
        at oracle.jbo.server.MetaObjectManager.loadFromXML(MetaObjectManager.java:516)
        at oracle.jbo.mom.DefinitionManager.loadLazyDefinitionObject(DefinitionManager.java:443)
        at oracle.jbo.mom.DefinitionManager.findDefinitionObject(DefinitionManager.java:303)
        at oracle.jbo.mom.DefinitionManager.findDefinitionObject(DefinitionManager.java:260)
        at oracle.jbo.server.MetaObjectManager.findMetaObject(MetaObjectManager.java:64
        at oracle.jbo.server.ApplicationModuleDefImpl.findDefObject(ApplicationModuleDefImpl.java:174)
        at oracle.jbo.server.ApplicationModuleImpl.createRootApplicationModule(ApplicationModuleImpl.java:309)
        at oracle.jbo.server.ApplicationModuleHomeImpl.create(ApplicationModuleHomeImpl.java:92)
        at oracle.apps.fnd.framework.webui.OAJSPApplicationRegistry.createStaticAKApplicationModule(OAJSPApplicationRegistry.java:344)
        at oracle.apps.fnd.framework.webui.OAJSPApplicationRegistry.getStaticAKApplicationModuleSync(OAJSPApplicationRegistry.java:313)
        at oracle.apps.fnd.framework.webui.OAJSPApplicationRegistry.getStaticAKApplicationModule(OAJSPApplicationRegistry.java:304)
        at oracle.apps.fnd.framework.webui.OAJSPHelper.getCharacterEncoding(OAJSPHelper.java:700)
        at oracle.apps.fnd.framework.webui.OAJSPHelper.setRequestCharacterEncoding(OAJSPHelper.java:655)
        at _oa__html._OA._jspService(_OA.java:64)
        at oracle.jsp.runtime.HttpJsp.service(HttpJsp.java:119)
        at oracle.jsp.app.JspApplication.dispatchRequest(JspApplication.java:385)
        at oracle.jsp.JspServlet.doDispatch(JspServlet.java:259)
        at oracle.jsp.JspServlet.internalService(JspServlet.java:17
        at oracle.jsp.JspServlet.service(JspServlet.java:14
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:58
        at org.apache.jserv.JServConnection.processRequest(JServConnection.java:456)
        at org.apache.jserv.JServConnection.run(JServConnection.java:294)
        at java.lang.Thread.run(Thread.java:479)




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安装的时候有没有发生什么错误？？？