org.jdom.input.JDOMParseException: Content is not allowed in trailing section

i work with jdom .this error was take place:

org.jdom.input.JDOMParseException: Error on 开发者_JAVA百科line 252 of document Articles.xml: Content is not allowed in trailing section.
        at org.jdom.input.SAXBuilder.build(SAXBuilder.java:530)
        at org.jdom.input.SAXBuilder.build(SAXBuilder.java:905)
        at org.jdom.input.SAXBuilder.build(SAXBuilder.java:884)

how can solve this error ?

thank you!

Check that your XML is valid and that there are no non-whitespace characters after the last closing tag of your XML document.

It seems like you have missed any one of mentioned

Not set grails proper Version
Missing application.properties file (with proper grails version)