Hi, When I use a refactoring action such as Insert element, I get the following error ! Description java.lang.IllegalArgumentException: Misdeclaration of xmlns namespace Severity Fatal System ID C:\Program Files\Oxygen XML Editor 19\refactoring\insert-element.xq<file:///C:\Program%20Files\Oxygen%20XML%20Editor%2019\refactoring\insert-element.xq> With the following trace. java.lang.IllegalArgumentException: Misdeclaration of xmlns namespace at net.sf.saxon.query.StaticQueryContext.declareNamespace(StaticQueryContext.java:750) at net.sf.saxon.s9api.XQueryCompiler.declareNamespace(XQueryCompiler.java:365) at ro.sync.exml.xmlrefactory.c.c.d.p(Unknown Source) at ro.sync.exml.xmlrefactory.c.c.d.g(Unknown Source) at ro.sync.exml.xmlrefactory.c.d.k(Unknown Source) at ro.sync.exml.xmlrefactory.c.c.c(Unknown Source) at ro.sync.exml.xmlrefactory.c.c.b(Unknown Source) at ro.sync.exml.xmlrefactory.ui.i.j(Unknown Source) at ro.sync.exml.xmlrefactory.ui.i.k(Unknown Source) at ro.sync.exml.xmlrefactory.ui.i.i(Unknown Source) at ro.sync.exml.xmlrefactory.ui.i$_b.rhe(Unknown Source) at ro.sync.ui.application.nb.run(Unknown Source) I tried to add a <test> element under the <foo> element in a file like this: <?xml version="1.0" encoding="UTF-8"?> <root> <foo/> </root> Can you help me? Best regards, Lionel MOIZEAU Head of Technical Information Department L-Acoustics Tel : +33 1 69 63 23 99 www.l-acoustics.com<http://www.l-acoustics.com/>