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this is bug in provided appclient.xml
can you create jira for it.
The fix is simple enough, so you don't have to wait for it to be merged and released. Just edit your JBOSS_HOME/appclient/configuration/appclient.xml to change the "naming" subsystem version from 1.0 to 1.2 as shown here https://github.com/wildfly/wildfly/pull/4944/files and then start the appclient.