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Capybara::Poltergeist::JavascriptError: One or more errors were raised in the Javascript code on the page. If you don't care about these errors, you can ignore them by setting js_errors: false in your Poltergeist configuration (see documentation for details). TypeError: 'undefined' is not a function (evaluating 'ReactElementValidator.createElement.bind( null, type )') TypeError: 'undefined' is not