Getting javax.faces.application.ApplicationFactory error when deploying WAR to JBoss EAP 6.x

Issue

• When deploying a WAR file to JBoss Enterprise Application Platform 6.0.1 the following error was shown and the application failed to deploy:

13:37:40,962 SEVERE [javax.faces] (MSC service thread 1-4) Application was not properly initialized at startup, could not find Factory: javax.faces.application.ApplicationFactory. Attempting to find backup.
13:37:40,962 ERROR [org.apache.catalina.core.ContainerBase.[jboss.web].[default-host].[/INTLWebApps]] (MSC service thread 1-4) Exception sending context initialized event to listener instance of class org.apache.myfaces.webapp.StartupServletContextListener: java.lang.IllegalStateException: Could not find backup for factory javax.faces.application.ApplicationFactory. 
    at javax.faces.FactoryFinder$FactoryManager.getFactory(FactoryFinder.java:1008) [jboss-jsf-api_2.1_spec-2.0.2.Final-redhat-1.jar:2.0.2.Final-redhat-1]
    at javax.faces.FactoryFinder.getFactory(FactoryFinder.java:343) [jboss-jsf-api_2.1_spec-2.0.2.Final-redhat-1.jar:2.0.2.Final-redhat-1]
    at org.apache.myfaces.context.servlet.FacesContextImplBase.getApplication(FacesContextImplBase.java:159) [myfaces-bundle-2.1.8.jar:2.1.8]
    at org.apache.myfaces.context.servlet.FacesContextImplBase.getELContext(FacesContextImplBase.java:210) [myfaces-bundle-2.1.8.jar:2.1.8]
    at javax.faces.component.UIViewRoot.setLocale(UIViewRoot.java:1463) [jboss-jsf-api_2.1_spec-2.0.2.Final-redhat-1.jar:2.0.2.Final-redhat-1]
    at org.apache.myfaces.webapp.AbstractFacesInitializer._createFacesContext(AbstractFacesInitializer.java:445) [myfaces-bundle-2.1.8.jar:2.1.8]
    at org.apache.myfaces.webapp.AbstractFacesInitializer.initStartupFacesContext(AbstractFacesInitializer.java:417) [myfaces-bundle-2.1.8.jar:2.1.8]
    at org.apache.myfaces.webapp.StartupServletContextListener.contextInitialized(StartupServletContextListener.java:113) [myfaces-bundle-2.1.8.jar:2.1.8]
    at org.apache.catalina.core.StandardContext.contextListenerStart(StandardContext.java:3392) [jbossweb-7.0.16.Final-redhat-1.jar:]
    at org.apache.catalina.core.StandardContext.start(StandardContext.java:3850) [jbossweb-7.0.16.Final-redhat-1.jar:]
    at org.jboss.as.web.deployment.WebDeploymentService.start(WebDeploymentService.java:90) [jboss-as-web-7.1.2.Final-redhat-1.jar:7.1.2.Final-redhat-1]
    at org.jboss.msc.service.ServiceControllerImpl$StartTask.startService(ServiceControllerImpl.java:1811)
    at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1746)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) [rt.jar:1.6.0_17]
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) [rt.jar:1.6.0_17]
    at java.lang.Thread.run(Thread.java:619) [rt.jar:1.6.0_17]

• This application deployed fine on EAP 5.