Error: proc macro `main` not expanded: Cannot create expander for

Question

I want to run a web server with Rust and Actix-Web. After following these steps of their documentation everything works as expected: the server runs on port 8080.

The problem I have is that VSCode shows errors

This error message is shown in the tooltip upon hovering the error in the IDE

proc macro main not expanded: Cannot create expander for /Users/name/Documents/projects/project-rust/target/debug/deps/libactix_web_codegen-b262af45f63000f3.dylib: Io(Custom { kind: InvalidData, error: DlOpen { desc: "dlopen(/Users/name/Documents/projects/project-rust/target/debug/deps/libactix_web_codegen-b262af45f63000f3.dylib, 0x000A): tried: '/Users/name/Documents/projects/project-rust/target/debug/deps/libactix_web_codegen-b262af45f63000f3.dylib' (mach-o file, but is an incompatible architecture (have 'arm64', need 'x86_64')), '/usr/local/lib/libactix_web_codegen-b262af45f63000f3.dylib' (no such file), '/usr/lib/libactix_web_codegen-b262af45f63000f3.dylib' (no such file)" } })

Environemnt - macOS Monterey 12.1 (M1)

Answer 1

VS Code

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Thanks, @Smitop for the tip

I reinstalled VSCode with universal build and the errors are gone

P.S. I tried to install the build for Apple Silicon, but it didn't help

NVIM (macOS, arm64, m1)

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For those experiencing the same issue in NeoVim, the following steps helped resolve the errors.

1. Open a terminal
2. Execute rustup toolchain list

It should print

stable-aarch64-apple-darwin (default)
stable-x86_64-apple-darwin 

3. Copy the stable-x86_64-apple-darwin and make it default, by using rustup default stable-x86_64-apple-darwin
4. Re-open NeoVim.
5. Errors should disappear