Error: WS Error <Io(Custom { kind: Other, error: "unexpected EOF" })>

[OoLunar]

I have the following piece of code for making a secure websocket:
main.rs:

let cert = X509::from_pem(std::fs::read_to_string("/etc/letsencrypt/archive/forsaken-borders.net/fullchain3.pem").unwrap().as_ref()).unwrap();
let pkey = PKey::private_key_from_pem(std::fs::read_to_string("/etc/letsencrypt/archive/forsaken-borders.net/privkey3.pem").unwrap().as_ref()).unwrap();
let mut builder = SslAcceptor::mozilla_intermediate(SslMethod::tls()).unwrap();
builder.set_private_key(&pkey).unwrap();
builder.set_certificate(&cert).unwrap();
let acceptor = builder.build();
ws::Builder::new().with_settings(ws::Settings { encrypt_server: true, ..ws::Settings::default() }).build(move |out: ws::Sender| structs::Irc { out, ssl: acceptor.clone() }).unwrap().listen("127.0.0.1:7325").unwrap()

structs.rs:

pub struct Irc {
    pub out: ws::Sender,
    pub ssl: openssl::ssl::SslAcceptor,
}

However, when parsing the SSL's, I get the error Error: WS Error <Io(Custom { kind: Other, error: "unexpected EOF" })> I know these SSL's work, because I'm using them right now on my website. Is there something else wrong that I'm doing?