Failure to restart AS7 after deployment

When I restart AS7 after having deployed something I craps out with the exception below.

Looking at the location that it complains about in standalone.xml it has:
<system-properties>
<property name="foo" value="bar"/>
<property name="key" value="value"/>
</system-properties>

This is the exception:
15:01:35,069 INFO [org.jboss.as] JBoss AS 7.0.0.Beta4-SNAPSHOT "(TBD)" starting
15:01:36,347 ERROR [org.jboss.msc.service.fail] MSC00001: Failed to start service jboss.as.server-controller: org.jboss.msc.service.StartException in service jboss.as.server-controller: org.jboss.as.controller.persistence.ConfigurationPersistenceException: Failed to parse configuration
at org.jboss.as.server.ServerControllerService.start(ServerControllerService.java:155) [jboss-as-server-7.0.0.Beta4-SNAPSHOT.jar:7.0.0.Beta4-SNAPSHOT]
at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1675) [jboss-msc-1.0.0.Beta8.jar:1.0.0.Beta8]
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) [:1.6.0_24]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) [:1.6.0_24]
at java.lang.Thread.run(Thread.java:680) [:1.6.0_24]
Caused by: org.jboss.as.controller.persistence.ConfigurationPersistenceException: Failed to parse configuration
at org.jboss.as.controller.persistence.XmlConfigurationPersister.load(XmlConfigurationPersister.java:113)
at org.jboss.as.server.ServerControllerService.start(ServerControllerService.java:153) [jboss-as-server-7.0.0.Beta4-SNAPSHOT.jar:7.0.0.Beta4-SNAPSHOT]
... 4 more
Caused by: javax.xml.stream.XMLStreamException: ParseError at [row,col]:[398,5]
Message: Unexpected element '

system-properties' encountered
at org.jboss.as.controller.parsing.ParseUtils.unexpectedElement(ParseUtils.java:64)
at org.jboss.as.controller.parsing.StandaloneXml.readServerElement(StandaloneXml.java:182)
at org.jboss.as.controller.parsing.StandaloneXml.readElement(StandaloneXml.java:87)
at org.jboss.as.controller.parsing.StandaloneXml.readElement(StandaloneXml.java:75)
at org.jboss.staxmapper.XMLMapperImpl.processNested(XMLMapperImpl.java:100)
at org.jboss.staxmapper.XMLMapperImpl.parseDocument(XMLMapperImpl.java:59)
at org.jboss.as.controller.persistence.XmlConfigurationPersister.load(XmlConfigurationPersister.java:105)
... 5 more