How can I declare this struct which has an Optional error field?

How can I declare this struct correctly?

PLAYGROUND CODE

use std::{error};

pub struct AppError {
  msg: Option<String>,
  // error: Option<anyhow::Error>, // This works
  error: Option<dyn error::Error + Send + Sync + 'static>, // but I need this, not anyhow
}

the error is:

error[E0277]: the size for values of type `(dyn std::error::Error + Send + Sync + 'static)` cannot be known at compilation time
 --> src/lib.rs:6:10
  |
6 |   error: Option<dyn error::Error + Send + Sync + 'static>, // but I need this, not anyhow
  |          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
  |
  = help: the trait `Sized` is not implemented for `(dyn std::error::Error + Send + Sync + 'static)`
note: required by a bound in `Option`

For more information about this error, try `rustc --explain E0277`.

How to fix this?

>Solution :

You can wrap your error in a Box

use std::{error};

pub struct AppError {
  msg: Option<String>,
  // error: Option<anyhow::Error>, // This works
  error: Option<Box<dyn error::Error + Send + Sync + 'static>>, // but I need this, not anyhow
}