title: Recast.ai: TypeError: Cannot read property 'attachment' of undefined
body: <p>I want my recast.bot reply to the user's response. Here is the code, but I got the error message below. How to resolve this issue? </p>
  
  <pre><code>Bot Server is running on port 5002
  TypeError: Cannot read property 'attachment' of undefined
      at new Message (C:\FD\Node\node_modules\recastai\lib\apis\resources\message.js:66:31)
      at Connect.handleMessage (C:\FD\Node\node_modules\recastai\lib\apis\connect\index.js:49:30)
      at C:\FD\Node\ct2Nbot.js:28:19
      at Layer.handle [as handle_request] (C:\FD\Node\node_modules\express\lib\router\layer.js:95:5)
      at next (C:\FD\Node\node_modules\express\lib\router\route.js:137:13)
      at Route.dispatch (C:\FD\Node\node_modules\express\lib\router\route.js:112:3)
      at Layer.handle [as handle_request] (C:\FD\Node\node_modules\express\lib\router\layer.js:95:5)
      at C:\FD\Node\node_modules\express\lib\router\index.js:281:22
      at Function.process_params (C:\FD\Node\node_modules\express\lib\router\index.js:335:12)
      at next (C:\FD\Node\node_modules\express\lib\router\index.js:275:10)
  </code></pre>
  
  <p>I am following their SDK: <a href="https://github.com/RecastAI/SDK-NodeJS/wiki/Receive-and-send-messages" rel="nofollow noreferrer">https://github.com/RecastAI/SDK-NodeJS/wiki/Receive-and-send-messages</a></p>
  
  <pre><code>    const express = require('express');
      const bodyParser = require('body-parser');
      const recastai = require('recastai').default;
      const build = new recastai.build('xxxxxx', 'en');
  
      var client = new recastai('xxxxxx')
  
      const app = express();
      const port = 5002;
      app.use(bodyParser.json());
  
     app.post('/', function(req, res) {
         client.connect.handleMessage(req, res, onMessage)
      })
      app.listen(port, () =&gt; {
          console.log('Bot Server is running on port ' + port);
      })  
  
      function onMessage (message) {
        var content = message.content    
        var type = message.type    
        message.addReply([{ type: 'text', content: 'Hello, world' }])
        message.reply()
          .then(res =&gt; console.log('message sent'))
      }
  </code></pre>