test2.json

[
	{"name":"Lucy","age":18,"achievement":[95,86.5,90]},
	{"name":"Lily","age":19,"achievement":[92.5,89,91]},
	{"name":"Jack","age":20,"achievement":[93,90,93.5]}
]

main.rs

use std::fs::File;
use std::io::BufReader;
use serde_json::{Result as SResult, Value};




fn get_profile() -> SResult<Value> {
    let file = File::open("test2.json").expect("file should open read only");
    let reader = BufReader::new(file);
    let mut v: Value = serde_json::from_reader(reader)?;
    Ok(v.take())
 }


fn main() {
    let profiles = get_profile().unwrap();

        for element in profiles.as_array().iter() {
        println!("the value is: {}", element["age"]);
    }

}

error:

λ cargo run
   Compiling hello-rust v0.1.0 (D:\workspace\rust-projects\hello-rust)
error[E0277]: the type `[Value]` cannot be indexed by `&str`
  --> src\main.rs:20:38
   |
20 |         println!("the value is: {}", element["age"]);
   |                                      ^^^^^^^^^^^^^^ slice indices are of type `usize` or ranges of `usize`
   |
   = help: the trait `SliceIndex<[Value]>` is not implemented for `&str`
   = note: required because of the requirements on the impl of `std::ops::Index<&str>` for `Vec<Value>`

For more information about this error, try `rustc --explain E0277`.
error: could not compile `hello-rust` due to previous error

上面的遍历json，应该怎么修改才对。请大佬指导一下