Visual studio 2005 Build error :- The volume for a file has been externally altered so that the opened file is no longer valid

Just clean the solution and rebuild.

 

Just dont have any idea why the above error happened this morning when I tried to add some code to a windows service and tried to build the solution.But it has a simple resolution,just clean the solution. 🙂  [Solution Explorer > Right click on the Solution> Select "Clean Solution"].