Error adding managed c++ assembly as asp.net reference

[andrew.j.matheny]

Hi,

I'm trying to include a dll written in managed C++ in a C# code behind
file for an asp.net website and I'm running into some problems.
Whenever I add the file as a reference to the asp.net project the
application refuses to build properly.

I get the following error message: Error 2 The specified module could
not be found. (Exception from HRESULT: 0x8007007E) (very
descriptive i know)

I get this error even when I have the code that uses the library
commented out. I don't think the problem is with the dll either
because I have other C# projects in the same solution that can use it
perfectly.

I'm adding the reference by right-clicking on the project and
selecting Add Reference...

Is there some inherent difficulty in using managed c++ assemblies with
asp.net?