[jboss-user] [Beginners Corner] - JBoss Portal Crash after deploying portlet

[BobBuilder]

I am using jboss-portal-2.7.2 and have created an new Portal (i am very new to jboss!)
Everything worked fine until i deployed the email-portlet. After i got it working in the portal i confiured it for an mail-server. the next thing that happened was that the portlet didnt work anymore. after i restarted the portal the portal itself didnt work anymore.
after login it shows this error message
exception
  | 
  | javax.servlet.ServletException: java.lang.NullPointerException
  | 	org.jboss.portal.server.servlet.PortalServlet.service(PortalServlet.java:278)
  | 	javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
  | 	org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
  | 
as solution i tried the following:
- undeploy the email-portlet
- deleting folders under jboss-portal-2.7.2\server\default except conf, deploy and lib

but the error message still appears. anyone an idea how i can solve such a problem?

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