Random error if multiple user send messages at a time in xmpp server

Question

I am using github.com/mattn/go-xmpp/xmpp golang package to send the messages to ejabberd. This is working fine but sometime it gives random error

client error : expected success or failure, got error in http://etherx.jabber.org/streams

client error : unmarshal iq: expected element type iq but have error

client error : unmarshal features: expected element type features but have

code is given below :

package main

import (

    "log"
    "time"
    "github.com/mattn/go-xmpp/xmpp"
)

func main() {

    options := xmpp.Options{
        Host:      "your_ejabberd_host",
        User:      "your_username",
        Password:  "your_password",
        Debug:     true,
        NoTLS:     false,
        DialTimeout: time.Second * 10,
    }

    conn, err := options.NewClient()
    if err != nil {
        log.Fatal("Failed to create XMPP client:", err)
    }

    // Send a sample message
    err = conn.Send(xmpp.Chat{
        Remote: "recipient_jid@example.com",
        Type:   "chat",
        Text:   "Hello, this is a test message!",
    })
    if err != nil {
        log.Fatal("Failed to send message:", err)
    }
    conn.Close()
    return
}