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Resolved: No SharePoint Site exists at the specified URL

I created a blank solution in VS2008 and added 8 projects in this solution. Out of 8 projects 6 were the different class library project, 1 was for Event Receivers and 1 was for Web Parts using VSeWss 1.3. Now i created a new web part inside web part project code it according to my Resolved: No SharePoint Site exists at the specified URL