The type initializer for 'ClosedXML.Excel.XLWorkbook' threw an exception
<pre><code>using ClosedXML.Excel;

class XLSXWriter : BExporter
    {
        private readonly string _fName;

        public XLSXWriter(string fileName)
        {
            _fName = fileName;
        }

        public override void Export(IEnumerable&lt;AnimalData&gt; animals)
        {
            var workBook = new XLWorkbook(); &lt;---Throws an exception

            var workSheet = workBook.Worksheets.Add("MySheet");

            workSheet.Cell("A1").Value = "Hello World";            

            FileStream fs = new FileStream(_fName, FileMode.Create);
            workBook.SaveAs(fs);
            fs.Close();          
        }
    }
</code></pre>

<p>Just trying this library <code>ClosedXML.dll</code>, and it throws an exception can't figure out what could be the problem.
I get the <code>_fName</code> from the <code>savefiledialog</code>.
Ideas anybody?</p>
