See parent jira JBIDE-10336 for steps to reproduce. Full log is here:

https://issues.jboss.org/secure/attachment/12349551/eclipse.log.Sun_Dec4_101125EST2011.clean-install-jbt-abridged-all-features.txt

!ENTRY org.jboss.ide.eclipse.as.management.as71 2 0 2011-12-04 10:29:51.541
Unable to render embedded object: File (MESSAGE [SCR] Found components with duplicated names) not found. Details:
Component1 : Component[
name = org.jboss.ide.eclipse.as.management.as7.service
activate = activate
deactivate = deactivate
modified =
configuration-policy = optional
factory = null
autoenable = true
immediate = true
implementation = org.jboss.ide.eclipse.as.internal.management.as71.JBoss71ManagerService
state = Unsatisfied
properties =

serviceFactory = false
serviceInterface = [org.jboss.ide.eclipse.as.core.server.v7.management.IJBoss7ManagerService]
references = null
located in bundle = org.jboss.ide.eclipse.as.management.as71_2.3.0.v20111202-0909-H875-M5 [786]
]
Component2: Component[
name = org.jboss.ide.eclipse.as.management.as7.service
activate = activate
deactivate = deactivate
modified =
configuration-policy = optional
factory = null
autoenable = true
immediate = true
implementation = org.jboss.ide.eclipse.as.internal.management.as7.JBoss7ManagerService
state = Unsatisfied
properties =

serviceFactory = false
serviceInterface = [org.jboss.ide.eclipse.as.core.server.v7.management.IJBoss7ManagerService]
references = null
located in bundle = org.jboss.ide.eclipse.as.management.as7_2.3.0.v20111202-0909-H875-M5 [785]
]