'Unable to automatically step into the server ' error.

Hi All,
I am making a functionality where I can drag and drop outlook email from Inbox to my C#.NET application. I have this function:
emailItem = ExchangeWebServiceWrapper.EWSWrap.GetEmailFromInternetMessageID(serviceBinding, Request.Form[
"txtImportMessageID"].ToString());
 It is working fine. Values of both serviceBinding ad txtImportMessageID are seen while debugging and emailItem gets populated.
 When I drag and drop an outlook email from some other custom folder, while debugging through the above function, emailItem is null and  i get this error : 'Unable to automatically step into the server machine failed. The Microsoft Visual Studio Remote Debugging Monitor (MSVSMON.EXE) does not appear to be running on the remote computer. Please see Help for assistance.
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