no method named 'lock' found for struct 'Stderr' in the current scope

[lorenzodelia125]

Hi, thanks for your Solana course and for this repo! I encountered an issue with this Rust project. When I try to launch cargo-build-bpf command the building process fails with the error: no method named 'lock' found for struct 'Stderr' in the current scope. I don't have any idea on how to resolve it.

p.s. I would also share with you that before this issue I have had another one about getrandom who I solved adding this dependecy in cargo.toml file in according with Solana docs: getrandom = { version = "^0.1.6", features = ["dummy"] }

[void-ness]

Hey, cargo build-bpf seems to be deprecated. Why don't you try using cargo build-sbf instead. Works fine for me while building a solana program for deployment.