Unable to run ExtractorConstructor is not a constructor TypeError

[sundarkmn]

When npm start with BOTFUEL_APP_TOKEN, BOTFUEL_APP_ID, BOTFUEL_APP_KEY, next to config success message, an error is appearing as
error: [Run] ExtractorConstructor is not a constructor TypeError: ExtractorConstructor is not a constructor
at /botfuel-sample-starter/botfuel-sample-starter/node_modules/botfuel-dialog/build/nlus/botfuel-nlu.js:118:16

[Fdec]

Hi
Same error with this tuto https://tutorials.botfuel.io/#/codelab/getting-started?step=6