AWS lambda function- 'An error has occurred: Received error response from Lambda: Handled'

Question

Working on AWS Lex for creating a ChatBot and using the Node.js in AWS Lambda.

Error: An error has occurred: Received error response from Lambda: Handled

Lambda function:

var aws = require('aws-sdk');
var ses = new aws.SES({region: 'us-east-1'});

    exports.handler = function(event, context, callback) {

        var eParams = {
            Destination: {
                ToAddresses: [event.currentIntent.slots.Email]
            },
            Message: {
                Body: {
                    Text: {
                        Data: "Hi, How are you?"
                    }
                },
                Subject: {
                    Data: "Title"
                }
            },

            Source: "[email protected]"
        };
        var email = ses.sendEmail(eParams, function(err, data){
            if(err) 
            else {

                context.succeed(event);

            }
        });
    };

How to get a proper response from Lambda to Lex after successful execution (Email Service works properly). I have tried context.done(); but it did not worked out.

Edit 1: Tried adding below response test from AWS Documentation for LEX still getting the same error response.

exports.handler = (event, context, callback) => { 

callback(null, { 
"dialogAction": { 
"type": "ConfirmIntent", 
"message": { 
"contentType": "PlainText or SSML", 
"content": "message to convey to the user, i.e. Are you sure you want a large pizza?" 
} 

} 


});

did you get any errors like Received invalid response from Lambda but this seems to be a 424 DependencyFailedException from here -> docs.aws.amazon.com/lex/latest/dg/API_runtime_PostText.html — yashhy
– yashhy, Commented May 24, 2017 at 15:05
@yashhy yes i di get the error, ye it is 424 DependencyFailedException — Sarthak Srivastava
– Sarthak Srivastava, Commented May 25, 2017 at 6:54
@yashhy yet to solve, i think need to give permissions to lex using the IAM role — Sarthak Srivastava
– Sarthak Srivastava, Commented May 25, 2017 at 7:05
@yashhy In IAM role there is already permission for Post Text '{ "Version": "2012-10-17", "Statement": [ { "Action": [ "lex:PostText" ], "Effect": "Allow", "Resource": "*" } ] }' — Sarthak Srivastava
– Sarthak Srivastava, Commented May 25, 2017 at 7:07

yashhy · Accepted Answer · 2017-05-25 13:53:24Z

As mentioned in the lambda-input-response-format docs here fulfillmentState property is required in the response.

Other thing is you have to pass either PlainText OR SSML for the contentType in the response. In your case its just PlainText.

    exports.handler = (event, context, callback) => {
      callback(null, {
        "dialogAction": {
          "type": "ConfirmIntent",
          "fulfillmentState": "Fulfilled", // <-- Required
          "message": {
            "contentType": "PlainText",
            "content": "message to convey to the user, i.e. Are you sure you want a large pizza?"
          }
        }
    });

The above code should solve your problem.

However if you see the req-res in the network tab you would receive HTTP Error 424 which says DependencyFailedException which says "Amazon Lex does not have sufficient permissions to call a Lambda function" very misleading.

Do you know if there's a typescript interface for the input & repsonse? I can't find any anywhere i look

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