Samuel Gerges Blog

When we tried to switch over to the Isolated Worker in Durable Functions on MacOs Mx, we hit a snag and encountered a pesky error. It threw us off our game and made us scratch our heads, like “what the heck is going on here?

Grpc.Core: Error loading native library. Not found in any of the possible locations: /Users ...

The error message made it clear that the issue was related to a missing file for ARM64 in MacOS, as the file mentioned in the error didn’t have a corresponding compilation for this platform. We attempted to resolve the issue by updating all dependent packages, but to no avail. It seems that the solution might lie in unreleased preview packages. However, we were able to find a possible solution after investigating the following website

https://github.com/einari/Grpc.Core.M1

This repository offers a NuGet package for utilizing Grpc on Mac Mx and includes a solution for compiling it locally. By following the provided instructions, you can compile it to the version that suits your needs. However, for Azure Functions, a simpler solution exists. You can download the file named “libgrpc_csharp_ext.arm64.dylib.azureFunctions” and copy it to the directory under your project. This should do the trick!

To include the necessary XML fragments into the <Project> node of your .csproj file, follow these steps:

1. Open your .csproj file in a text editor.
2. Find the <Project> node.
3. Copy the following XML fragment and paste it into the <Project> node and Save and close the .csproj file
4. This should ensure that the “libgrpc_csharp_ext.arm64.dylib.azureFunctions” file is included in the output directory when you build your project.

    <ItemGroup>
      <Content Include=".azureFunctions\libgrpc_csharp_ext.arm64.dylib">
        <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
      </Content>
    </ItemGroup>