I get the message: '(# 100) No matching users were found', when using the textbook textbook code

Question

Using the same Facebook getting started guide ( https://developers.facebook.com/docs/messenger-platform/quickstart )

I get an error on the node.js console when I type in a message and send it to the bot.

{ error: { message: '(#100) No matching user found', type: 'OAuthException', code: 100, fbtrace_id: 'BLguK1o+VsH' } } } 

I have the latest version of node.js and I use Ngrok to publish my localhost.

My app.post routine is below: (This is an exact copy of the getting started guide)

 router.post('/webhook', function (req, res) { var data = req.body; // Make sure this is a page subscription if (data.object == 'page') { // Iterate over each entry // There may be multiple if batched data.entry.forEach(function(pageEntry) { var pageID = pageEntry.id; var timeOfEvent = pageEntry.time; // Iterate over each messaging event pageEntry.messaging.forEach(function(messagingEvent) { if (messagingEvent.optin) { receivedAuthentication(messagingEvent); } else if (messagingEvent.message) { receivedMessage(messagingEvent); } else if (messagingEvent.delivery) { receivedDeliveryConfirmation(messagingEvent); } else if (messagingEvent.postback) { receivedPostback(messagingEvent); } else { console.log("Webhook received unknown messagingEvent: ", messagingEvent); } }); }); // Assume all went well. // // You must send back a 200, within 20 seconds, to let us know you've // successfully received the callback. Otherwise, the request will time out. // res.sendStatus(200); } }); 

Here is the receivedMessage function called

 function receivedMessage(event) { var senderID = event.sender.id; var recipientID = event.recipient.id; var timeOfMessage = event.timestamp; var message = event.message; console.log("Received message for user %d and page %d at %d with message:", senderID, recipientID, timeOfMessage); console.log(JSON.stringify(message)); var messageId = message.mid; // You may get a text or attachment but not both var messageText = message.text; var messageAttachments = message.attachments; if (messageText) { // If we receive a text message, check to see if it matches any special // keywords and send back the corresponding example. Otherwise, just echo // the text we received. switch (messageText) { case 'image': sendImageMessage(senderID); break; case 'button': sendButtonMessage(senderID); break; case 'generic': sendGenericMessage(senderID); break; case 'receipt': sendReceiptMessage(senderID); break; default: //getArticles(function(err,articles){ // sendTextMessage(senderID, articles[0].text); //}); sendTextMessage(senderID, messageText); /* client.converse('my-user-session-42', messageText, {}) .then((data) => { console.log('the question asked :' + messageText); sendTextMessage(senderID, data.msg); console.log('Yay, got Wit.ai response: ' + JSON.stringify(data)); }).catch(console.error); */ } } else if (messageAttachments) { sendTextMessage(senderID, "Message with attachment received"); } } 

The following are instructions:

 const bodyParser = require('body-parser'); var express = require('express'); var request = require('request'); var router = express.Router(); const fetch = require('node-fetch'); const {Wit, log} = require('node-wit'); 

Here are the other functions used:

 function sendTextMessage(recipientId, messageText) { var messageData = { recipient: { id: recipientId }, message: { text: messageText } }; callSendAPI(messageData); } function callSendAPI(messageData) { request({ uri: 'https://graph.facebook.com/v2.6/me/messages', qs: { access_token: PAGE_ACCESS_TOKEN }, method: 'POST', json: messageData }, function (error, response, body) { if (!error && response.statusCode == 200) { var recipientId = body.recipient_id; var messageId = body.message_id; console.log("Successfully sent generic message with id %s to recipient %s", messageId, recipientId); } else { console.error("Unable to send message."); console.error(response); console.error(error); } }); } 

So, I read somewhere that all this has to do with page ids or the way facebook handles ints, but I'm a bit confused.

Any help would be greatly appreciated.

Answer 1

This error occurs because the wrong token is used to send messages back to the bot. Make sure that you have the correct one (even with hard coding) that can be copied from the developers.facebook.com page under Messenger → Settings → Token Generation.

Answer 2

You just need to get around your own posts.

Your bot has a unique identifier (this is not an application identifier), so you can try this workaround in your POST logic:

 var myID = '...' ; ..... event = req.body.entry[0].messaging[i]; sender = event.sender.id; if (event.message && event.message.text && sender != myID) { ..... } 

You can get your bot id by looking at your posts:

 "sender":{ "id":"USER_ID" }, 

Message received with link

JSON example:

 even.message: {"sender":{"id":"**yourBotID**"}, "recipient":{"id":"**clientID**"}, "timestamp":1468241667962, "message": {"**is_echo":true**, "app_id":**appID**, "mid":"mid....", "seq":617,"text":"..."}} 

Tip. To determine your bot address, simply find the "message": {"is_echo": true, .. in the message payload.

Hello

Answer 3

I followed this guide http://x-team.com/2016/04/how-to-get-started-with-facebook-messenger-bots/

and it all worked:

I posted my code below:

 'use strict' const bodyParser = require('body-parser'); var express = require('express'); var request = require('request'); var app = express(); const fetch = require('node-fetch'); const {Wit, log} = require('node-wit'); app.use(bodyParser.urlencoded({extended: false})) var PAGE_ACCESS_TOKEN = '********' var MY_TOKEN = '********'; // Wit.ai code const client = new Wit({accessToken: '*********'}); // GET home page. app.get('/', function(req, res, next) { res.render('index', { title: 'Express' }); }); app.get('/webhook/', function(req, res) { if (req.query['hub.mode'] === 'subscribe' && req.query['hub.verify_token'] === 'hello_token_success') { console.log("Validating webhook"); res.status(200).send(req.query['hub.challenge']); } else { console.error("Failed validation. Make sure the validation tokens match."); res.sendStatus(403); } }); //** Receive Messages ** app.post('/webhook/', function (req, res) { var data = req.body; var events = req.body.entry[0].messaging; for (var i = 0; i < events.length ; i++) { var event = events[i]; if (event.message && event.message.text && !event.message.is_echo) { var text = event.message.text; sendTextMessage(event.sender.id, "Text received, echo: "+ text.substring(0, 200)); } } // Assume all went well. // // You must send back a 200, within 20 seconds, to let us know you've // successfully received the callback. Otherwise, the request will time out. res.sendStatus(200); }); function receivedMessage(event) { var senderID = event.sender.id.toString(); var recipientID = event.recipient.id.toString(); var timeOfMessage = event.timestamp; var message = event.message; console.log("Received message for user %d and page %d at %d with message:", senderID, recipientID, timeOfMessage); console.log(JSON.stringify(message)); var messageId = message.mid; // You may get a text or attachment but not both var messageText = message.text; var messageAttachments = message.attachments; if (messageText && !message.is_echo) { // If we receive a text message, check to see if it matches any special // keywords and send back the corresponding example. Otherwise, just echo // the text we received. switch (messageText) { case 'image': sendImageMessage(senderID); break; case 'button': sendButtonMessage(senderID); break; case 'generic': sendGenericMessage(senderID); break; case 'receipt': sendReceiptMessage(senderID); break; default: sendTextMessage(senderID, messageText); } } else if (messageAttachments) { sendTextMessage(senderID, "Message with attachment received"); } } function sendGenericMessage(recipientId) { var messageData = { recipient: { id: recipientId }, message: { attachment: { type: "template", payload: { template_type: "generic", elements: [{ title: "rift", subtitle: "Next-generation virtual reality", item_url: "https://www.oculus.com/en-us/rift/", image_url: "http://messengerdemo.parseapp.com/img/rift.png", buttons: [{ type: "web_url", url: "https://www.oculus.com/en-us/rift/", title: "Open Web URL" }, { type: "postback", title: "Call Postback", payload: "Payload for first bubble", }], }, { title: "touch", subtitle: "Your Hands, Now in VR", item_url: "https://www.oculus.com/en-us/touch/", image_url: "http://messengerdemo.parseapp.com/img/touch.png", buttons: [{ type: "web_url", url: "https://www.oculus.com/en-us/touch/", title: "Open Web URL" }, { type: "postback", title: "Call Postback", payload: "Payload for second bubble", }] }] } } } }; callSendAPI(messageData); } function receivedPostback(event) { var senderID = event.sender.id; var recipientID = event.recipient.id; var timeOfPostback = event.timestamp; // The 'payload' param is a developer-defined field which is set in a postback // button for Structured Messages. var payload = event.postback.payload; console.log("Received postback for user %d and page %d with payload '%s' " + "at %d", senderID, recipientID, payload, timeOfPostback); // When a postback is called, we'll send a message back to the sender to // let them know it was successful sendTextMessage(senderID, "Postback called"); } function sendTextMessage(recipientId, messageText) { var messageData = { recipient: { id: recipientId }, message: { text: messageText } }; callSendAPI(messageData); } function callSendAPI(messageData) { request({ uri: 'https://graph.facebook.com/v2.6/me/messages', qs: { access_token: PAGE_ACCESS_TOKEN }, method: 'POST', json: messageData }, function (error, response, body) { if (!error && response.statusCode == 200) { var recipientId = body.recipient_id; var messageId = body.message_id; console.log("Successfully sent generic message with id %s to recipient %s", messageId, recipientId); } else { console.error("Unable to send message."); console.error(response); console.error(error); } }); } module.exports = app; 

Answer 4

I went to Facebook Messenger settings → Webhooks → Edit Events and deleted messenger_echoes from the signed events. This solved the problem.

Answer 5

Make sure you use the correct recipient ID. The recipient is not the identifier of the page or application, but it is (if you want to send a message to the user) the user ID.

You can set up a webhook, for example https://requestb.in , and view the requests from the messenger and the identifier you are looking for:

 {"sender":{"id":"1499894473423552"}}