epplus:LoadFromCollection出现“列超出范围”错误

下面是loadfromcollection的“column out of range”错误代码。插入到要复制的epplus附带的sampleapp中。

我是做了什么怪事还是做了个虫子?或者我还没有设置的配置设置?

public class tst
    {
        public string Name;
        [Description("Created Time")]
        public DateTime Created_time;
    }


     var pck = new ExcelPackage();

            var kpcollection = new List<tst>();
            for (var i = 1; i <= 10; i++)
            {
                kpcollection.Add(new tst
                {
                    Name = "line" + i.ToString(),
                    Created_time = DateTime.Now
                });
            }

            var wsenum = pck.Workbook.Worksheets.Add("KPTest");
            //Load the collection starting from cell A1...
            wsenum.Cells["A1"].LoadFromCollection(kpcollection, true, TableStyles.Medium9);