The Blog of Ian Mercer.

Mixed mode assembly errors after upgrade to .NET 4 Beta 2

10/21/2009, 9:35 PM

I began receiving this error after upgrading to .NET Beta 2 ...

System.IO.FileLoadException: Mixed mode assembly is built against version 'v1.1.4322' of the runtime and cannot be loaded in the 4.0 runtime without additional configuration information.

I suspect it's the Managed.DirectX DLL that I'm using.

Adding the following to the application config file appears to have solved the problem for now:-

    <configuration>
        <startup useLegacyV2RuntimeActivationPolicy="true"\>
         <supportedRuntime version="v4.0"\>
        </startup>
    </configuration>

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