Don’t have colons at the start of feature or scenario names. It’s probably a mistake if you have them from double typing the colon after the Feature or Scenario keyword.

Bad

Feature: :My Feature
  Scenario: :My Scenario
    Given I have visited the website
    When I log in
    Then I will see my account

Good

Feature: My Feature
  Scenario: My Scenario
    Given I have visited the website
    When I log in
    Then I will see my account