16:02:22,046 ERROR [org.jboss.as.server] (Controller Boot Thread) JBAS015956: Caught exception during boot: org.jboss.as.controller.persistence.ConfigurationPersistenceException: JBAS014676: Failed to parse configuration
    at org.jboss.as.controller.persistence.XmlConfigurationPersister.load(XmlConfigurationPersister.java:141) [jboss-as-controller-7.5.7.Final-redhat-3.jar:7.5.7.Final-redhat-3]
    at org.jboss.as.server.ServerService.boot(ServerService.java:336) [jboss-as-server-7.5.7.Final-redhat-3.jar:7.5.7.Final-redhat-3]
    at org.jboss.as.controller.AbstractControllerService$1.run(AbstractControllerService.java:263) [jboss-as-controller-7.5.7.Final-redhat-3.jar:7.5.7.Final-redhat-3]
    at java.lang.Thread.run(Thread.java:745) [rt.jar:1.8.0_45]
Caused by: javax.xml.stream.XMLStreamException: ParseError at [row,col]:[420,4]
Message: JBAS014789: Unexpected element '{urn:jboss:domain:1.8}sso' encountered
    at org.jboss.as.controller.parsing.ParseUtils.unexpectedElement(ParseUtils.java:86) [jboss-as-controller-7.5.7.Final-redhat-3.jar:7.5.7.Final-redhat-3]
    at org.jboss.as.controller.parsing.ParseUtils.nextElement(ParseUtils.java:77) [jboss-as-controller-7.5.7.Final-redhat-3.jar:7.5.7.Final-redhat-3]
    at org.jboss.as.server.parsing.StandaloneXml.readServerElement_1_4(StandaloneXml.java:482) [jboss-as-server-7.5.7.Final-redhat-3.jar:7.5.7.Final-redhat-3]
    at org.jboss.as.server.parsing.StandaloneXml.readElement(StandaloneXml.java:145) [jboss-as-server-7.5.7.Final-redhat-3.jar:7.5.7.Final-redhat-3]
    at org.jboss.as.server.parsing.StandaloneXml.readElement(StandaloneXml.java:107) [jboss-as-server-7.5.7.Final-redhat-3.jar:7.5.7.Final-redhat-3]
    at org.jboss.staxmapper.XMLMapperImpl.processNested(XMLMapperImpl.java:110) [staxmapper-1.1.0.Final-redhat-3.jar:1.1.0.Final-redhat-3]
    at org.jboss.staxmapper.XMLMapperImpl.parseDocument(XMLMapperImpl.java:69) [staxmapper-1.1.0.Final-redhat-3.jar:1.1.0.Final-redhat-3]
    at org.jboss.as.controller.persistence.XmlConfigurationPersister.load(XmlConfigurationPersister.java:133) [jboss-as-controller-7.5.7.Final-redhat-3.jar:7.5.7.Final-redhat-3]
    ... 3 more