Issues with post request

[George3d6]

I'm trying to make a post request using the following code, based on the yew docs:

#[derive(Deserialize, Debug, Clone)]
pub struct ReqMsg {    
    message: String,
    code: i32,
}

enum Msg {
    Toggle,
    Update,
    Inaction,
    GotReqMsg(Result<ReqMsg, anyhow::Error>),
}

fn upload_my_data(&self, data: &Range) {
        let s: String = data.start.to_string().into();
        let e: String = data.end.to_string().into();
        let ad = Json(json!({
            "start": s, 
            "end": e, 
            "diff_from_utc": data.diff_from_utc
        }));

        let post_request = Request::post("/api/range/data")
        .header("Content-Type", "application/json")
        .body(ad).unwrap();
        
        
        let callback = self.link.callback(|response: Response<Json<anyhow::Result<ReqMsg, anyhow::Error>>>| {
            let Json(data) = response.into_body();
            Msg::GotReqMsg(data)
        });

        let task = FetchService::fetch(post_request, callback).unwrap();

        self.fetch_task = Some(task);
        ConsoleService::info("Upload callback created");
    }

Whereupon I get the following compilation error:

let task = FetchService::fetch(post_request, callback).unwrap();
    |                    ^^^^^^^^^^^^^^^^^^^ the trait `From<Json<serde_json::Value>>` is not implemented for `Result<std::string::String, anyhow::Error>`

I'm unable to understand what's happening here, is this some sort of version incompatibility issue? Is a Result being returned instead of just the value contained within somewhere where it shouldn't be?