vscode does not work when it has multiple cargo projects？

I'm learning to use rust，i am using vscode。 I have two cargo projects in my workspace，Why rust-analyzer only has an error message in the first project, but not in the second。

Is there any setting required?

You need to create workspace:

• Create Cargo.toml in your root project
• Add this code:

[workspace]
members = [
    "./<your-cargo-project1>",
    "./<your-cargo-project2>",


]