Integration

Hi I installed Oracle application server 10g. I successfully installed it. But when i stopped the opmn and emctl process and now when i am trying to start i am able to successfully start but when i type the URL of OAS Admin console. I get following error:
500 Internal Server Error
java.lang.NoClassDefFoundError: oracle/sysman/eml/app/Console at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java(Compiled Code)) at com.evermind[Oracle Application Server Containers for J2EE 10g (10.1.2.0.2)].server.http.HttpApplication.loadServlet(HttpApplication.java:2283) at com.evermind[Oracle Application Server Containers for J2EE 10g (10.1.2.0.2)].server.http.HttpApplication.findServlet(HttpApplication.java:4795) at com.evermind[Oracle Application Server Containers for J2EE 10g (10.1.2.0.2)].server.http.HttpApplication.getRequestDispatcher(HttpApplication.java:2821) at com.evermind[Oracle Application Server Containers for J2EE 10g (10.1.2.0.2)].server.http.HttpRequestHandler.processRequest(HttpRequestHandler.java:680) at com.evermind[Oracle Application Server Containers for J2EE 10g (10.1.2.0.2)].server.http.HttpRequestHandler.run(HttpRequestHandler.java:285) at com.evermind[Oracle Application Server Containers for J2EE 10g (10.1.2.0.2)].server.http.HttpRequestHandler.run(HttpRequestHandler.java:126) at com.evermind[Oracle Application Server Containers for J2EE 10g (10.1.2.0.2)].util.ReleasableResourcePooledExecutor$MyWorker.run(ReleasableResourcePooledExecutor.java:192) at java.lang.Thread.run(Thread.java:568)

Can any one please help me resolve this issue at the earliest?