mysql backup exception System.argumentOutOffRange exception

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C#

.NET

MySQL

i have refer this mysql backup example
MySqlBackup.NET - MySQL Backup Solution for C#, VB.NET, ASP.NET[^]
when i will take backup of mysql database it will show the following exception

System.argumentOutOffRange exception : Year,Month & day parameters describe an unrepresentable DateTime
at system.Datetime.DatetiTicks(Int32 year,Int32 Month,Int32 day)
at system.Datetime...ctor(int32 year,Int32 Month,Int32 day,int32 hour,int32 minute ,int32 second,int32 milllisecond,datetimekind kind)
at mysql.data.types.mysqlDatetime.GetDatetime();
at mysql.data.mysqlclient.mysqldatareader.getValue(int32 i)
at mysql.data.mysqlclient.mysqldatareader.get_item(int32 i)
at mysql.data.mysqlclient.mysqldatareader.getsqlvaluestring(mysqldatareader rdr)
at mysql.data.mysqlclient.mysqlbackup.ExportStart()
at mysql.data.mysqlclient.mysqlbackup.ExportExecute()

plz suggest any solution on this exception.>

MySqlBackup mb;
    SaveFileDialog sf = new SaveFileDialog();
    sf.FileName = "test " + DateTime.Now.ToString("yyyyMMdd HHmmss") + ".sql";
    if (sf.ShowDialog() != System.Windows.Forms.DialogResult.OK)
    {
        return;
    }

    ProgressBar1.Value = 0;
    timerRead.Start();
    mb.Connection = new MySqlConnection(txtConstr.Text);
    mb.ExportInfo.FileName = sf.FileName;
    mb.ExportInfo.AsynchronousMode = true;
    mb.ExportInfo.CalculateTotalRowsFromDatabase = true;
    mb.ExportInfo.ExportTableStructure = true;
    mb.ExportInfo.ExportRows = true;
    mb.Export();

you can refer the

mysqlbackupnet/MySqlBackup.NET/MySqlBackup.cs

file for export() function
Thanks