ERROR [IM002] [Microsoft][ODBC Driver Manager] Data source name not found and no default driver specified

Hi ,
when ia m trying to unit test my application using Visual studio unit tests when i am testing the webservice call my test is failing and giving me this message .
as i am doing this as part of migration from earlier version..

"Test method BusinessLogicUnitTest.xxRepositoryTest.IsOpenTest threw exception:  System.Web.Services.Protocols.SoapException: Server was unable to process request. --> ERROR [IM002] [Microsoft][ODBC Driver Manager] Data source name not found and no default driver specified."

System.Web.Services.Protocols.SoapHttpClientProtocol.ReadResponse(SoapClientMessage message, WebResponse response, Stream responseStream, Boolean asyncCall)
System.Web.Services.Protocols.SoapHttpClientProtocol.Invoke(String methodName, Object[] parameters)
BusinessLogic.Info.Isxyz(String osAttrCode, String osDateInQuestion, String osTimeInQuestion) in
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The error message says Data Source Name not found.  If this is a webserver application, create a System Data Source Name on the webserver or if its a desktop application, create it on your desktop.
To create Data Source Name:
Control Panel => Administrative Tools => Data Souces (ODBC)

Please select System DSN so that it applies for all users

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Swetha_aJaXAuthor Commented:
It is happening when i am calling web service from my application.
is there any problem withthe webservice or my app ?
From the error message, it appears the issue is in the WebService.
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