OpenFire - ERROR 404 Problem accessing /login.jsp Reason: Servlet Not Initialized

I recently finished installing the OpenFire on CentOS, release 6.6 (Final).

I followed the instructions as it says in its documentation.

I'm getting this error:

Here is the text:

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HTTP ERROR 404

Problem accessing /login.jsp. Reason:

    Servlet Not Initialized

Caused by:

javax.servlet.UnavailableException: Servlet Not Initialized

  at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:518)

  at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.ja va:1359)

  at com.opensymphony.module.sitemesh.filter.PageFilter.doFilter(PageFilter.java:39)

  at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.ja va:1330)

  at org.jivesoftware.util.LocaleFilter.doFilter(LocaleFilter.java:74)

  at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.ja va:1330)

  at org.jivesoftware.util.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingF ilter.java:50)

  at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.ja va:1330)

  at org.jivesoftware.admin.PluginFilter.doFilter(PluginFilter.java:78)

  at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.ja va:1330)

  at org.jivesoftware.admin.AuthCheckFilter.doFilter(AuthCheckFilter.java:164)

  at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.ja va:1330)

  at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:478)

  at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:119)

  at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:520)

  at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:22 7)

  at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:94 1)

  at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:409)

  at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:186 )

  at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:875 )

  at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:117)

  at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandler Collection.java:250)

  at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.jav a:149)

  at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:110)

  at org.eclipse.jetty.server.Server.handle(Server.java:349)

  at org.eclipse.jetty.server.HttpConnection.handleRequest(HttpConnection.java:441)

  at org.eclipse.jetty.server.HttpConnection$RequestHandler.headerComplete(HttpConne ction.java:919)

  at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:582)

  at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:218)

  at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:51 )

  at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.jav a:586)

  at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java :44)

  at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:598 )

  at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:533)

  at java.lang.Thread.run(Thread.java:745)

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I have no idea what I can do...

Thanks for your help.