Rust Book 12.3 未解决的导入错误 [E4032]

我对Rust 还不熟悉，正在做Chapter 12.3 in the book年的练习.

我很有信心，我的代码和书中的代码是一样的(因为"剪报"很难确定).然而，当我从项目目录minigrep/中try cargo build或cargo run时，我得到了一个未解决的导入错误

src/main.rs

use std::env;
use std::process;

use minigrep;
use minigrep::Config;

fn main() {
    let args: Vec<String> = env::args().collect();

    let config = Config::new(&args).unwrap_or_else(|err| {
        println!("Problem parsing args: {}", err);
        process::exit(1);
    });

    println!("Searching for {}", config.query);
    println!("In file {}", config.filename);

    if let Err(e) = minigrep::run(config) {
         println!("Application error: {}", e);

         process::exit(1);
    }
}

src/lib.rs

use std::fs;
use std::error::Error;

pub struct Config {
    pub query: String,
    pub filename: String,
}

impl Config {
    pub fn new(args: &[String]) -> Result <Config, &'static str> {
        if args.len() < 3 {
            return Err("not enough args");
        }

        let query = args[1].clone();
        let filename = args[2].clone();

        Ok(Config { query, filename })
    }
}

pub fn run(config: Config) -> Result<(), Box<dyn Error>> {

    let contents = fs::read_to_string(config.filename)?;

    println!("With text:\n {}", contents);

    Ok(())

}