ByBit API v5 returning error code 170130: "Data sent for parameter '%s' is not valid." No explanation of what parameter '%s' is

I am trying to send a spot order using a unified account. There is absolutely no info about what this error message means and as far as I can tell from the ByBit v5 API docs I am doing everything correct. I have already established that the signature is formatted properly. This is the request being sent along:

RequestBuilder {method: POST,url: Url {    scheme: "https",    cannot_be_a_base: false,    username: "",    password: None,    host: Some(        Domain("api.bybit.com",        ),    ),    port: None,    path: "/v5/order/create",    query: None,    fragment: None,},headers: {"content-type": "application/json","x-bapi-api-key": xxxxxxxxxxxxxx,"x-bapi-timestamp": "1676755850417","x-bapi-sign": xxxxxxxxxxxxxxxx,"x-bapi-recv-window": "5000",},}

The request body that gets attached when the request is sent:

{"category":"spot","symbol":"ETHUSDT","side":"Sell","order_type":"Market","qty":"0.1"}

This is the Rust code used to send the request:

    // Set up the HTTP client    let client = reqwest::Client::new();    let mut headers = HeaderMap::new();    headers.insert("Content-Type", HeaderValue::from_static("application/json"));    headers.insert("X-BAPI-API-KEY", HeaderValue::from_str(&api_key)?);    headers.insert("X-BAPI-TIMESTAMP", HeaderValue::from_str(&timestamp)?);    headers.insert("X-BAPI-SIGN", HeaderValue::from_str(&sign)?);    headers.insert("X-BAPI-RECV-WINDOW", HeaderValue::from_static(recv_window));    let body = serde_json::to_string(&order)?;        // Submit the order        let request = client            .post("https://api.bybit.com/v5/order/create")            .headers(headers.clone())            .body(body.clone());        let response = request.send().await?;

And this is the response received:

Response {url: Url {    scheme: "https",    cannot_be_a_base: false,    username: "",    password: None,    host: Some(        Domain("api.bybit.com",        ),    ),    port: None,    path: "/v5/order/create",    query: None,    fragment: None,},status: 200,headers: {"content-type": "application/json; charset=utf-8","content-length": "122","x-bapi-limit": "20","x-bapi-limit-status": "19","x-bapi-limit-reset-timestamp": "1676755851552","ret_code": "170130","traceid": "78d2bec29fead6e40447a63ba1eae5d9","timenow": "1676755851556","server": "Openresty","expires": "Sat, 18 Feb 2023 21:30:51 GMT","cache-control": "max-age=0, no-cache, no-store","pragma": "no-cache","date": "Sat, 18 Feb 2023 21:30:51 GMT","connection": "keep-alive",},}