MSC000001: Failed to start service jboss.web.deployment.default-host

14:36:59,418 ERROR [org.jboss.msc.service.fail] (MSC service thread 1-6) MSC000001: Failed to start service jboss.web.deployment.de
fault-host./: org.jboss.msc.service.StartException in service jboss.web.deployment.default-host./: Failed to start service
        at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1936) [jboss-msc-1.1.5.Final-redhat
-1.jar:1.1.5.Final-redhat-1]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [rt.jar:1.8.0_112]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [rt.jar:1.8.0_112]
        at java.lang.Thread.run(Thread.java:745) [rt.jar:1.8.0_112]
Caused by: java.lang.IllegalArgumentException: JBWEB000250: Child container with name  already exists
        at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:794)
        at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:785)
        at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:353)
        at org.jboss.as.web.deployment.WebContextInjector.inject(WebContextInjector.java:62)
        at org.jboss.as.web.deployment.WebContextInjector.inject(WebContextInjector.java:38)
        at org.jboss.msc.inject.CastingInjector.inject(CastingInjector.java:55) [jboss-msc-1.1.5.Final-redhat-1.jar:1.1.5.Final-red
hat-1]

Solution

1. Check duplicate context path in your ear. if duplicate context paths is present please modify the context path to be different.
2. Check configuration.xml  set enable-welcome-root="false" eg.<virtual-server name="default-host" enable-welcome-root="false">