I can not cargo.

[franklili3]

When I have done precious steps, and run"cargo run --geth-spec.json", the error appears,
"error[E0554]: #[feature] may not be used on the stable release channel
--> C:\Users\franknbw10.cargo\registry\src\github.com-1ecc6299db9ec823\serde_codegen-0.8.16\src\lib.rs:5:43
|
5 | #![cfg_attr(not(feature = "with-syntex"), feature(rustc_private, plugin))]
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: aborting due to previous error

Build failed, waiting for other jobs to finish...
error: Could not compile serde_codegen.". How can I do?

[keorn]

You are trying to run with stable Rust compiler, nightly is required.
As per third command in the instructions run: rustup default nightly before trying to cargo run.