Thread:Extension talk:Maps/Fatal error GoogleMaps3.php on line 98

Receiving this error while trying to install the Map. Anyone know the reason for it?

Fatal error: Class 'MapsMappingServices' not found in mediawiki/extensions/Maps-master/includes/services/GoogleMaps3/GoogleMaps3.php on line 98

MediaWiki 1.22.3 PHP 5.3.28 (cgi-fcgi) MySQL 5.1.72-2