Why EAP6 throws ClassNotFoundException for org.jboss.as.server.Services ?

Issue

• While starting JBoss EAP 6 server as a standalone, getting the following ERROR stackTrace:

  12:00:44,518 ERROR [org.jboss.as.controller.management-operation] (ServerService Thread Pool -- 26) JBAS014612: Operation ("add") failed - address: ([
    ("subsystem" => "deployment-scanner"),
    ("scanner" => "default")
]): java.lang.NoClassDefFoundError: org/jboss/as/server/Services
    ...
Caused by: java.lang.ClassNotFoundException: org.jboss.as.server.Services from [Module "org.jboss.as.deployment-scanner:main" from local module loader @1a64e307 (finder: local module finder @5574ee1a (roots: /path/jboss-eap-6.2/modules,/path/jboss-eap-6.2/modules/system/layers/base))]
    ...
12:00:51,314 ERROR [org.jboss.as.controller.management-operation] (Controller Boot Thread) "JBAS014784: Failed executing subsystem deployment-scanner boot operations"