Error

The error occurs because your type contains a non-Send field, such as Rc<T>, preventing it from being moved across threads. Add the Send trait bound to your struct or function to explicitly allow the type to be transferred between threads.

use std::sync::Arc;

struct MyData {
    value: Arc<i32>, // Arc is Send, Rc is not
}

fn send_data(data: MyData) {
    // This now compiles because MyData is Send
}

If you are using Rc<T>, replace it with Arc<T> to make the type Send.

The "the trait Send is not implemented" error means your code tries to move data to a new thread, but the data type isn't safe to share across threads. Think of it like trying to mail a document that is only valid in one specific room; you need a copy that is valid everywhere. You fix this by using thread-safe versions of your data containers, like swapping Rc for Arc.