Currently, WildFly does not have the functionality to automatically switching to a different stability level schema based on the stability level of the server. As a result, if the stability of the server is higher than the lowest level schema in the standalone.xml file, the server fails with the following error: 

15:40:04,426 ERROR [org.jboss.as.server] (Controller Boot Thread) WFLYSRV0055: Caught exception during boot: org.jboss.as.controller.persistence.ConfigurationPersistenceException: WFLYCTL0085: Failed to parse configuration

A warning needs to be added to the WildFly docs to remind the user to change the schema version manually to the right version.