form validation behat test fails in clean

001 Scenario: Attempt to create event without fill required fields should display validation errors # /var/www/html/calendar/tests/behat/calendar.feature:159

      And I follow "Calendar"                                                                       # /var/www/html/calendar/tests/behat/calendar.feature:167

        The "(//html/.//a

        [./@href][((./@id = 'Calendar' or contains(normalize-space(string(.)), 'Calendar') or contains(./@title, 'Calendar') or contains(./@rel, 'Calendar')) or .//*[(contains(concat(' ', @class, ' '), ' icon ') or name() = 'img') and (contains(./@alt, 'Calendar') or contains(./@title, 'Calendar'))])] | //html/.//*

        [translate(./@role, 'ABCDEFGHIJKLMNOPQRSTUVWXYZ', 'abcdefghijklmnopqrstuvwxyz') = 'link'][((./@id = 'Calendar' or contains(./@value, 'Calendar')) or contains(./@title, 'Calendar') or contains(normalize-space(string(.)), 'Calendar'))])[1]" xpath node is not visible and it should be visible