This is due to a parsing error in the taza gem. If this is your library, you can fix it by changing instances of {browser.element_by_xpath(...)} in examples on lib/taza/page.rb to include spaces around the braces ({ browser... }). Omitting the braces throws off YARD and causes it to interpret the reference as a class method, which is invalid in that context.

If this is not your library, I would recommend reporting the error to http://github.com/hammernight/taza -- the issue can reproduced by running yard --debug on the project locally.