problem with the admin page

[luckk]

hello, i have managed to build apleap and it runs under windows XP service pack 2 with the following url:
http://localhost:8100/atleap/rw/pages/index.en.do
i cannot go to the admin page of the site with the following url:
http://localhost:8100/atleap/admin.do

i got this error message:

500 Internal server error
java.lang.NoSuchMethodError: com.blandware.atleap.jsp.login_jsp.access$0(Lcom/blandware/atleap/jsp/login_jsp;Ljavax/servlet/jsp/tagext/JspTag;Ljavax/servlet/jsp/PageContext;)Z
        at com.blandware.atleap.jsp.login_jsp$login_jspHelper.invoke0(login_jsp.java:195)
        at com.blandware.atleap.jsp.login_jsp$login_jspHelper.invoke(login_jsp.java:213)
        at com.blandware.atleap.webapp.taglib.core.logic.RedirectTag.doTag(RedirectTag.java:290)
        at com.blandware.atleap.jsp.login_jsp._jspx_meth_atleap_redirect_0(login_jsp.java:162)
        at com.blandware.atleap.jsp.login_jsp._jspService(login_jsp.java:65)
        at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
        at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487)
        at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1097)
        at com.blandware.atleap.webapp.filter.StatisticsCollectionFilter.doFilter(StatisticsCollectionFilter.java:75)
        at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1088)
        at com.blandware.atleap.webapp.filter.LoginFilter.doFilter(LoginFilter.java:136)
        at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1088)
        at org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:265)
        at org.acegisecurity.intercept.web.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:107)
        at org.acegisecurity.intercept.web.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:72)
        at org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:275)
        at org.acegisecurity.ui.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:124)
        at org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:275)
        at org.acegisecurity.providers.anonymous.AnonymousProcessingFilter.doFilter(AnonymousProcessingFilter.java:125)
        at org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:275)
        at org.acegisecurity.wrapper.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:81)
        at org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:275)
        at org.acegisecurity.context.HttpSessionContextIntegrationFilter.doFilter(HttpSessionContextIntegrationFilter.java:249)
        at org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:275)
        at org.acegisecurity.util.FilterChainProxy.doFilter(FilterChainProxy.java:149)
        at org.acegisecurity.util.FilterToBeanProxy.doFilter(FilterToBeanProxy.java:98)
        at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1088)
        at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:96)
        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
        at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1088)
        at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:360)
        at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
        at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
        at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:729)
        at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)
        at org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114)
        at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
        at org.mortbay.jetty.Server.handle(Server.java:324)
        at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:505)
        at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:829)
        at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:513)
        at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
        at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:380)
        at org.mortbay.jetty.bio.SocketConnector$Connection.run(SocketConnector.java:228)
        at org.mortbay.thread.BoundedThreadPool$PoolThread.run(BoundedThreadPool.java:450)


can anybody help ?

thx