Task: Question Answering
Input (English): passage: A perfect game is defined by Major League Baseball as a game in which a pitcher (or combination of pitchers) pitches a victory that lasts a minimum of nine innings in which no opposing player reaches base. Thus, the pitcher (or pitchers) cannot allow any hits, walks, hit batsmen, or any opposing player to reach base safely for any other reason and the fielders cannot make an error that allows an opposing player to reach a base; in short, ``27 up, 27 down.'' The feat has been achieved 23 times in MLB history -- 21 times since the modern era began in 1900, most recently by Félix Hernández of the Seattle Mariners on August 15, 2012. A perfect game is also a no-hitter and a shutout. A fielding error that does not allow a batter to reach base, such as a misplayed foul ball, does not spoil a perfect game. Weather-shortened contests in which a team has no baserunners and games in which a team reaches first base only in extra innings do not qualify as perfect games under the present definition.
 question: can there be an error in a perfect game?
Output (English): Yes