UnexpectedValueException ... SemanticMediaWiki::initExtension is not callable
From semantic-mediawiki.org
refs https://sourceforge.net/p/semediawiki/mailman/message/36610156/
Remove any manual reference to wfLoadExtension( 'SemanticMediaWiki' ) in your LocalSettings.php and make sure you use enableSemantics to enable Semantic MediaWiki (remove the 'enableSemantics' to disable SMW).
