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Editorial Team
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Asked: 2026-06-13T10:01:33+00:00

When I deploy my web application to an Azure Web Site, I am getting

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When I deploy my web application to an Azure Web Site, I am getting the following error:

Could not load file or assembly ‘FSharp.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a’ or one of its dependencies. The system cannot find the file specified.

I have encountered this in the past when deploying to an IIS server and fixed it by installing the F# redistributable http://www.microsoft.com/en-us/download/details.aspx?id=13450

Does anyone know what I can do to get this working on an Azure Web Site (not an Azure Web Role)?

Also, I do have Copy Local set to true for the FSharp.Core library from where it is being referenced.

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  1. Editorial Team

    Reposting from comment:

    In my experience, in order to use an F# library from a C# project in Azure, it is necessary to reference FSharp.Core directly from the C# project in order for the proper assemblies to be uploaded. With C#-to-C# project references the ‘Copy Local’ property seems to propagate correctly, whereas with C#-to-F# references it does not.

    I assume compiling with the --standalone flag probably works as well, but I haven’t tried it personally.

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