[80d546ceb230609473e3eaa4] [no req]   Error: Interface 'Opis\JsonSchema\ISchemaLoader' not found
Backtrace:
from /var/www/html/w/extensions/WikiLambda/includes/Validation/YumYumYamlLoader.php(16)
#0 /var/www/html/w/includes/AutoLoader.php(226): require_once()
#1 [internal function]: AutoLoader::autoload()
#2 /var/www/html/w/extensions/WikiLambda/includes/Validation/SchemaFactory.php(50): spl_autoload_call()
#3 /var/www/html/w/extensions/WikiLambda/includes/Validation/ZObjectStructureValidator.php(40): MediaWiki\Extension\WikiLambda\Validation\SchemaFactory::getCanonicalFormFactory()
#4 /var/www/html/w/extensions/WikiLambda/includes/ZObjectFactory.php(227): MediaWiki\Extension\WikiLambda\Validation\ZObjectStructureValidator::createCanonicalValidator()
#5 /var/www/html/w/extensions/WikiLambda/includes/ZObjectFactory.php(129): MediaWiki\Extension\WikiLambda\ZObjectFactory::create()
#6 /var/www/html/w/extensions/WikiLambda/includes/ZObjectContent.php(175): MediaWiki\Extension\WikiLambda\ZObjectFactory::createPersistentContent()
#7 /var/www/html/w/extensions/WikiLambda/includes/ZObjectContent.php(188): MediaWiki\Extension\WikiLambda\ZObjectContent->validateContent()
#8 /var/www/html/w/extensions/WikiLambda/includes/ZObjectContentHandler.php(553): MediaWiki\Extension\WikiLambda\ZObjectContent->isValid()
#9 /var/www/html/w/includes/content/Transform/ContentTransformer.php(46): MediaWiki\Extension\WikiLambda\ZObjectContentHandler->preSaveTransform()
#10 /var/www/html/w/includes/Storage/DerivedPageDataUpdater.php(941): MediaWiki\Content\Transform\ContentTransformer->preSaveTransform()
#11 /var/www/html/w/includes/Storage/PageUpdater.php(339): MediaWiki\Storage\DerivedPageDataUpdater->prepareContent()
#12 /var/www/html/w/includes/Storage/PageUpdater.php(883): MediaWiki\Storage\PageUpdater->prepareUpdate()
#13 /var/www/html/w/extensions/WikiLambda/includes/Hooks.php(283): MediaWiki\Storage\PageUpdater->saveRevision()
#14 /var/www/html/w/extensions/WikiLambda/includes/Hooks.php(178): MediaWiki\Extension\WikiLambda\Hooks::insertContentObject()
#15 /var/www/html/w/includes/installer/DatabaseUpdater.php(595): MediaWiki\Extension\WikiLambda\Hooks::createInitialContent()
#16 /var/www/html/w/includes/installer/DatabaseUpdater.php(552): MediaWiki\Installer\DatabaseUpdater->runUpdates()
#17 /var/www/html/w/maintenance/update.php(195): MediaWiki\Installer\DatabaseUpdater->doUpdates()
#18 /var/www/html/w/maintenance/includes/MaintenanceRunner.php(703): UpdateMediaWiki->execute()
#19 /var/www/html/w/maintenance/doMaintenance.php(100): MediaWiki\Maintenance\MaintenanceRunner->run()
#20 /var/www/html/w/maintenance/update.php(308): require_once(string)
#21 {main}