I get the following error even on MW version 1.30 even though the correct MW version is installed and the correct version's extension files were used:
Fatal error: Uncaught exception 'Exception' with message 'Scribunto is not compatible with the current MediaWiki core (version 1.29.1), it requires: >=1.30.0.' in /var/www/html/mediawiki/includes/registration/ExtensionRegistry.php:261 Stack trace: #0 /var/www/html/mediawiki/includes/registration/ExtensionRegistry.php(148): ExtensionRegistry->readFromQueue(Array) #1 /var/www/html/mediawiki/includes/Setup.php(40): ExtensionRegistry->loadFromQueue() #2 /var/www/html/mediawiki/includes/WebStart.php(139): require_once('/var/www/html/m...') #3 /var/www/html/mediawiki/index.php(40): require('/var/www/html/m...') #4 {main} thrown in /var/www/html/mediawiki/includes/registration/ExtensionRegistry.phpon line 261