Error on AutoLabel when running locally

[JerryMacedoCastro]

I'm running an instance of mergeable locally. I could create a validator to auto merge my pr's but I can't configure to auto label.

I did some test with a simple rule but I'm getting the error below:

Here is my mergeable.yml:

mergeable:
  - when: pull_request.*, pull_request_review.*
    validate:
      - do: title
        must_include:
          regex: 'bugfix'
    pass:
      - do: labels
        add: ['bug']
    fail:
      - do: comment
        payload:
          body: >
            Test

I'm was able to make it work in my public github account but it's not working on github enterprise. Thanks in advance