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[birt-dev] upgrade from birt 2.3 to 4.4 occurred issues

Environment:
ÂJDK 1.6
application server :Jboss 4.2.3
current birt 2.2(runninig fine)
now i want to upgrade to birt 4.4, other environment not changes.
below is error:

10:19:42,838 ERROR Marking servlet ViewerServlet as unavailable

10:19:42,838 ERROR [[ViewerServlet]] Allocate exception for servlet ViewerServlet

org.apache.commons.discovery.DiscoveryException: Class org.apache.commons.logging.impl.SLF4JLogFactory does not implement org.apache.commons.logging.LogFactory

how to fix this ? maybe I need your guys help. Thank a lot.