SmartThreadPool Error while going the threads in loop.

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C#

I have a project with SmartThreadPool.I have a list of IPs to get DNS Names.I get list of IPs from dataBase in a dataTable.If the table contains 1 IP means The below code executes well no error. If the table Contains more than 1 IP means The below code throw an error saying that

"The SmartThreadPool has been shutdown\Object name: 'SmartThreadPool.Internal.WorkItemsQueue"

This is the code that I have used.

               for(int i=0;i<=dt.rows.count;i++
{
                     sd.OnPing += new PingDelegate(OnHostPing);
                    _hosts.Add(sd);
                    iWorkItemsGrp.QueueWorkItem(new WorkItemCallback(sd.Start), new   object());
}