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!

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

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It seems like you have missed any one of mentioned

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