Resolved! – AWS Lex: ‘An error has occurred: Received error response from Lambda: Handled’

While invoking Lambda function through AWS Lex we generally get below error.

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

There could be many reasons for this error to occur.

Suppose lambda has following callback response function in node.js:


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

Now according to the AWS docs here the fullfilmentState is a mandatory key field also it should be assigned a single value either “Fullfilled” or “failed“.

Similarly for contentType also assign only a single value, either “Plaintext” or “SSML

Like the code below:


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?"
}
}
});

So this is one of the reasons why Lex gets this response from Lambda.

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” which is very misleading.

 

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