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Xsl file could not be processed: /xsl/CSBA_CASchoolNewsIssue.xslt
![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="compiler:generated"> (2)(XmlQueryRuntime {urn:schemas-microsoft-com:xslt-debug}runtime, XPathNavigator IssueID, IList`1 IssueItem, IList`1 InPrint, IList`1 ElectronicOnly, IList`1 IPArticles, IList`1 EOArticles, XPathNavigator IPArticleIDs, XPathNavigator EOArticleIDs)
at <xsl:template match="*">(XmlQueryRuntime {urn:schemas-microsoft-com:xslt-debug}runtime)
at Root(XmlQueryRuntime {urn:schemas-microsoft-com:xslt-debug}runtime)
at System.Xml.Xsl.XmlILCommand.Execute(Object defaultDocument, XmlResolver dataSources, XsltArgumentList argumentList, XmlWriter writer)
at Mvp.Xml.Common.Xsl.MvpXslTransform.TransformToWriter(XmlInput defaultDocument, XsltArgumentList xsltArgs, XmlWriter targetWriter)
at Mvp.Xml.Common.Xsl.MvpXslTransform.Transform(XmlInput input, XsltArgumentList arguments, XmlOutput output)
at Sitecore.Web.UI.WebControls.XslFile.DoRender(HtmlTextWriter output, Item item)](/temp/iconcache/applications/16x16/warning.png)