The type 'COMSVCSLib.ObjectControl' is defined in an assembly that is not referenced

I have two VB 6 assemblies (DLLs). ProgramA.dll, and ProgramB.dll, which I need to add as reference in my .NET Web Service (version 2.0).
I was handed over these two DLLs by different developers.
One developer gave me simply ProgramA.dll
The other developer gave me ProgramB.dll, ProgramB.exp, and ProgramB.lib
I simply registered ProgramA.dll using regsvr32 and added its reference in my .NET project
I then added reference of ProgramB.dll in my .NET project
Now when I try to build my .NET Web Service, it is giving me following error: The type 'COMSVCSLib.ObjectControl' is defined in an assembly that is not referenced. I can see following files in References of .NET application: COMSVCSLib Interop.COMSVCSLib Interop.ProgramA Interop.ProgramB

Also, the code is showing problem with ProgramB assembly (for which I had those .exp and .lib files)

What could be the possible reason, or am I doing anything wrong here?

Solution

You shouldn't have two different references on COMSVCSLib. You could try to remove one or the other.

PS: .exp and .lib files are useless for a .NET client