Fatal error: Uncaught Error: Undefined constant MediaWiki\MainConfigNames::OutputPipelineStages in H:\root\home\rlyehable-001\www\rlyehable\w2\includes\registration\ExtensionProcessor.php:63 Stack trace: #0 H:\root\home\rlyehable-001\www\rlyehable\w2\includes\registration\ExtensionRegistry.php(438): [constant expression]() #1 H:\root\home\rlyehable-001\www\rlyehable\w2\includes\registration\ExtensionRegistry.php(329): MediaWiki\Registration\ExtensionRegistry->readFromQueue() #2 H:\root\home\rlyehable-001\www\rlyehable\w2\includes\Setup.php(288): MediaWiki\Registration\ExtensionRegistry->loadFromQueue() #3 H:\root\home\rlyehable-001\www\rlyehable\w2\includes\WebStart.php(85): require_once('...') #4 H:\root\home\rlyehable-001\www\rlyehable\w2\api.php(37): require('...') #5 {main} thrown in H:\root\home\rlyehable-001\www\rlyehable\w2\includes\registration\ExtensionProcessor.php on line 63