Assembly manifest error

I a开发者_开发知识库m trying to deploy a dll to the assembly folder.C:\Windows\Assembly When i drop this DLL it gives me the following error messsage :

the module 'foo.dll' was expected to contain an assembly manifest.

what could be the possible problem as this is the only assembly that is throwing this error whereas all the remaining assemblies get deployed without any hassle.

Thanks.

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Use mt.exe from the Windows SDK to compare the manifests of the problem DLL with those of the working ones.

http://msdn.microsoft.com/en-us/library/aa375649(VS.85).aspx