Fatal error: Uncaught MediaWiki\Registration\ExtensionDependencyError: ModernTimeline requires SemanticMediaWiki to be installed.
 in /mnt/web018/e2/08/52039108/htdocs/mediawiki/includes/Registration/ExtensionRegistry.php:479
Stack trace:
#0 /mnt/web018/e2/08/52039108/htdocs/mediawiki/includes/Registration/ExtensionRegistry.php(331): MediaWiki\Registration\ExtensionRegistry->readFromQueue(Array)
#1 /mnt/web018/e2/08/52039108/htdocs/mediawiki/includes/Setup.php(279): MediaWiki\Registration\ExtensionRegistry->loadFromQueue()
#2 /mnt/web018/e2/08/52039108/htdocs/mediawiki/includes/WebStart.php(73): require_once('/mnt/web018/e2/...')
#3 /mnt/web018/e2/08/52039108/htdocs/mediawiki/index.php(36): require('/mnt/web018/e2/...')
#4 {main}
  thrown in /mnt/web018/e2/08/52039108/htdocs/mediawiki/includes/Registration/ExtensionRegistry.php on line 479