A problem in Weblogic 7.0.

Hi,
I am using weblogic 7.0  and now i am able to create a .jar (EJB) and
i deployed this in weblogic, and for webcomponent, i am uploaded the entire
docroot
folder and now the problem is,

Both the components are available in weblogic, But, i am able to open the
applicaton Login page
and when i try to login to the application it is saying that:

Error 500--Internal Server Error 
  
From RFC 2068 Hypertext Transfer
Protocol -- HTTP/1.1:

10.5.1 500 Internal Server Error 

The server encountered an unexpected condition which prevented it from
fulfilling the request.

Please copy this screen (Alt+Print Screen), paste it into a MS-Word document
(Ctrl+V) and send the Word document to ea-trader-support@interleasing.co.uk. 

java.lang.NullPointerException at
com.gmac.sm.web.action.MainHeaderAction.getFirstLevelLinks(MainHeaderAction.java
:276) at
com.gmac.sm.web.action.MainHeaderAction.getMainHeaders(MainHeaderAction.java:211
) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.jav
a:25) at java.lang.reflect.Method.invoke(Method.java:324) at
org.apache.struts.actions.DispatchAction.dispatchMethod(DispatchAction.java:280)
at org.apache.struts.actions.DispatchAction.execute(DispatchAction.java:216) at
org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.
java:484) at
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:274) at
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482) at
org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:507) at
javax.servlet.http.HttpServlet.service(HttpServlet.java:740) at
javax.servlet.http.HttpServlet.service(HttpServlet.java:853) at
weblogic.servlet.internal.ServletStubImpl$ServletInvocationAction.run(ServletStu
bImpl.java:1104) at
weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:430
) at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:20) at
weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:27) at
weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAp
pServletContext.java:5770) at
weblogic.security.service.SecurityServiceManager.runAs(SecurityServiceManager.ja
va:690) at
weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletContex
t.java:3230) at
weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java:264
2) at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:262) at
weblogic.kernel.ExecuteThread.run(ExecuteThread.java:224
 

Can you please advice on this.

Thanks,