JSON expected error

[justin8]

Hey,

I'm trying to set this up for the first time, and when testing the function either through the alexa developer console or directly in the lambda console using the test phrase in the wiki docs ("is The Dark Knight on the list") I receive the below response:

{
  "version": "1.0",
  "response": {
    "outputSpeech": {
      "type": "SSML",
      "ssml": "<speak>An error occured: {\"error\":\"JSON expected\"}</speak>"
    },
    "speechletResponse": {
      "outputSpeech": {
        "ssml": "<speak>An error occured: {\"error\":\"JSON expected\"}</speak>"
      },
      "directives": [],
      "shouldEndSession": true
    }
  },
  "sessionAttributes": {}
}

The local.json file is the only change I made (other than a small script to generate it using stored secrets for api keys that sits in the root). The local.json file without keys can be seen here: https://github.com/justin8/alexa-libby/blob/master/local_template.json

jq reports the local.json file as valid json as well.