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Resource is ambiguous,imported from the namespaces or types 'System,System.web

Posted By:      Posted Date: September 09, 2010    Points: 0   Category :ASP.Net
Hi, I have one project in TFS and once i get latest version it gives following error. "Resource is ambiguous,imported from the namespaces or types 'System,System.web'"   Even i have checked twice that there is no duplication but still giving error.   Please help me on same. Thanks in advance 

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---------------------------------------- ----------
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2010-09-25 03:28:38.15 spid51   
Memory node Id = 0                KB
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