The specified procedure could not be found. (os error 127) - #![plugin(rocket_codegen)]

Question

I am a newbie with Rust programming and I am building Rust + Diesel + Rocket framework.

When I run the command cargo check or cargo run, the following error occurs:

The specified procedure could not be found. (os error 127)
--> src\main.rs:2:11
|
2 | #![plugin(rocket_codegen)]

OS: Windows 10

cargo.toml

[package]
name = "rest_in_rust"
version = "0.1.0"
authors = ["venka"]

[dependencies]
diesel = { version = "1.0.0", features = ["postgres"]}
dotenv = "0.9.0"
r2d2 = "0.8.3"
serde = "1.0.80"
serde_derive = "1.0.80"
serde_json = "1.0.33"

rocket = {  git = "https://github.com/SergioBenitez/Rocket" }
rocket_codegen = {  git = "https://github.com/SergioBenitez/Rocket" }
rocket_contrib = {  git = "https://github.com/SergioBenitez/Rocket", default-features = false, features = ["json"] }

Rust Version: rustc 1.32.0-nightly (0c999ed13 2018-12-03)

main.rs file (the 2nd line throws me this error) any clue?

 #![feature(plugin, custom_derive, const_fn, decl_macro)]
 #![plugin(rocket_codegen)]

 #[macro_use]
 extern crate diesel;
 extern crate dotenv;
 extern crate r2d2;
 extern crate rocket;
 extern crate rocket_contrib;
 #[macro_use]
 extern crate serde_derive;
 #[macro_use]
 extern crate serde_json;

 use dotenv::dotenv;
 use std::env;
 use diesel::prelude::*;
 use diesel::pg::PgConnection;

 mod schema;
 mod models;
 mod db;
 mod static_file;

Please review how to create a minimal reproducible example and then edit your question to include it. We cannot tell what modules, etc. are present in the code (such as schema) If these aren't required to reproduce the problem, remove them; if they are required, provide them, minimized as much as possible. Try to produce something that reproduces your error in a brand new Cargo project with the minimal amount of code needed. There are Rust-specific MCVE tips as well. — Shepmaster

CdVr CdVr · Accepted Answer · 2018-12-09T17:04:58

My Cargo.toml has

rocket = { git = "https://github.com/SergioBenitez/Rocket" }
rocket_codegen = { git = "https://github.com/SergioBenitez/Rocket" }

which will pull the latest version. For me, it fetched Rocket 0.4.0. Since Rocket 0.4, rocket_codegen should not be a direct dependency.

Simply remove it:

Cargo.toml

[dependencies]
rocket = "0.4"

main.rs

#![feature(proc_macro_hygiene, decl_macro)]
#[macro_use] extern crate rocket;

Please check the change log in the news section of the Rocket Documentation.

The specified procedure could not be found. (os error 127) - #![plugin(rocket_codegen)]

1 Answers