removed cask error

[johntharian]

• Have you followed the guidelines in our
  Contributing document?

• Does your PR affect documented changes or does it add new functionality
  that should be documented? If yes, have you created a PR for
  dvc.org documenting it or at
  least opened an issue for it? If so, please add a link to it.

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[johntharian]

i know the issue is closed ,but since this is my first pr i wanted to submit this

[efiop]

@johntharian The first one was #2717 and it got successfully merged ;) Thanks a lot!