System.IO.FileLoadException When running Web application

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I am currently building a ASP.NET 4 application.

I have a DLL called CommupointServiceLibrary. Each time that I try to run the web application I get the following error message.

Could not load file or assembly 'CommupointServicesLibrary, Version=4.0.0.0, Culture=neutral, PublicKeyToken=e3a9262f077d766f' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040).

The dll is .NET 3.5

What I am doing wrong?

Posted 30-May-13 20:16pm

Pkay22

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Bernhard Hiller · Answer 1 · 2013-05-30T21:05:00

The server uses .Net version 4 and thus tries to load dlls built for .Net 4.
In Windows applications, you'd add to app.config in the <configuration></configuration> section:

XML

<startup useLegacyV2RuntimeActivationPolicy="true">
</startup>

There should be something similar for web applications.