UnexpectedValueException ... SemanticMediaWiki::initExtension is not callable

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Administrator manualInstallationInstallation/TroubleshootingUnexpectedValueException ... SemanticMediaWiki::initExtension is not callable

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 enabled (or when removing to disable) Semantic MediaWiki.