There are several items in the UML that may cause a converter error.

Most likely causes:

	1. If you get error similar to this:

     Location: line 3 of file:/tmp/AirliftEntityXML43632.xml
javax.xml.bind.UnmarshalException: Unexpected end of element {}:entityTypes
	at airliftj.util.entityModelUMLToXML.jaxb.generated.impl.runtime.SAXUnmarshallerHandlerImpl.handleEvent(SAXUnmarshallerHandlerImpl.java:538)

some class in the UML is likely missing the <<EntityType>> tag or <<ExternalEntityType>> tag.