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System.Xml.Xsl.XslTransformException: An error occurred during a call to extension function 'FormatIsoDate'. See InnerException for a complete description of the error. ---> System.ArgumentException: Empty strings are not allowed. Parameter name: isoDate at Sitecore.Diagnostics.Assert.ArgumentNotNullOrEmpty(String argument, String argumentName) at Sitecore.DateUtil.FormatIsoDate(String isoDate, String format) --- End of inner exception stack trace --- at System.Xml.Xsl.Runtime.XmlExtensionFunction.Invoke(Object extObj, Object[] args) at System.Xml.Xsl.Runtime.XmlQueryContext.InvokeXsltLateBoundFunction(String name, String namespaceUri, IList`1[] args) at <xsl:template name="Showlist">(XmlQueryRuntime {urn:schemas-microsoft-com:xslt-debug}runtime, IList`1 pubs) at <xsl:template match="*" mode="main">(XmlQueryRuntime {urn:schemas-microsoft-com:xslt-debug}runtime, XPathNavigator {urn:schemas-microsoft-com:xslt-debug}current) at <xsl:template match="*">(XmlQueryRuntime {urn:schemas-microsoft-com:xslt-debug}runtime) at Root(XmlQueryRuntime {urn:schemas-microsoft-com:xslt-debug}runtime) at Execute(XmlQueryRuntime {urn:schemas-microsoft-com:xslt-debug}runtime) at System.Xml.Xsl.XmlILCommand.Execute(Object defaultDocument, XmlResolver dataSources, XsltArgumentList argumentList, XmlSequenceWriter results) at System.Xml.Xsl.XmlILCommand.Execute(Object defaultDocument, XmlResolver dataSources, XsltArgumentList argumentList, XmlWriter writer, Boolean closeWriter) at System.Xml.Xsl.XmlILCommand.Execute(IXPathNavigable contextDocument, XmlResolver dataSources, XsltArgumentList argumentList, XmlWriter results) at System.Xml.Xsl.XslCompiledTransform.Transform(IXPathNavigable input, XsltArgumentList arguments, XmlWriter results) at Mvp.Xml.Common.Xsl.MvpXslTransform.TransformToWriter(XmlInput defaultDocument, XsltArgumentList xsltArgs, XmlWriter xmlWriter) at Mvp.Xml.Common.Xsl.MvpXslTransform.Transform(XmlInput input, XsltArgumentList arguments, XmlOutput output) at Sitecore.Web.UI.WebControls.XslFile.DoRender(HtmlTextWriter output, Item item) Xsl file could not be processed: /xsl/Risoe_dk/Risoe_dk_PublicationList.xslt