Description2 not compatible with the 1.38 :
AH01071: Got error 'PHP message: PHP Deprecated: Use of ParserOutput::getProperty was deprecated in MediaWiki 1.38. [Called from MediaWiki\\Extension\\Description2\\Description2::onOutputPageParserOutput in XXX/h/httpdocs/extensions/Description2/includes/Description2.php at line 105] in /XXX/h/httpdocs/includes/debug/MWDebug.php on line 375PHP message: PHP Deprecated: Use of ParserOutput::setProperty was deprecated in MediaWiki 1.38. [Called from MediaWiki\\Extension\\Description2\\Description2::setDescription in /XXX/httpdocs/extensions/Description2/includes/Description2.php at line 33] in /var/www/vhosts/fallout-wiki.com/httpdocs/includes/debug/MWDebug.php on line 375'