title: sendbird error 400 bad request /user not found
body: <p>I am trying to play with sendbird. I am getting this error . I am trying to make sendbird api work in react.js app.  I have read the documentation and it wasnt clear to me. I have looked at stackoverflow earlier replies and Thats why , i tried to create channel after i get connected to sendbird. </p>
  
  <pre><code>   VM2257:1 POST https://api.sendbird.com/v3/group_channels 400 (BAD 
     REQUEST)
  
  error is here p {name: "SendBirdException", code: 400201, message: "User not found."}
  </code></pre>
  
  <p>I am trying to implement it in react.js . Here's my code. Can someone help me out with how to rectify this error.</p>
  
  <pre><code>    import React, { Component } from 'react';
  import * as SendBird from 'sendbird';
  import './App.css';
  var sb = new SendBird({'appId': '59BEEA34-BDC7-461B-B10B-63705C8B57C2'});
  
  
  class App extends Component {
  
  
    componentWillMount(){
  
      sb.connect("ankur1", function(user, error) {
       if(user){
         console.log("looks like connected",user)
         var userIds = ['unique_user_id1', 'unique_user_id2','ankur1'];
         var name = "amazing1";
         sb.GroupChannel.createChannelWithUserIds(userIds, false, name,  function(createdChannel, error) {
           if (error) {
               console.error("error is here",error);
               return;
           }
  
           console.log("success",createdChannel);
         });
       }
       else{
         console.log("looks like error")
       }
  
      })
    }
  
  
    sm(){
      console.log("button clicked",sb)
      var channel = "amazing"
      /*
      sb.channel.sendUserMessage("that is cool", '', function(message, error){
      if (error) {
          console.error(error);
          return;
      }
  
      console.log(message);
  });
  */
  
  
  
    }
  
    componentDidMount(){
  
  
    }
    render() {
      var sm = this.sm.bind(this)
      return (
        &lt;div&gt;
  
        &lt;h1&gt;ankur is here &lt;/h1&gt;
        &lt;button onClick={sm}&gt;click here&lt;/button&gt;
  
        &lt;/div&gt;
      );
    }
  }
  
  export default App;
  </code></pre>