Found it: 

[Sun Aug 30 17:31:19.555745 2020] [php7:error] [pid 2002] [client 194.207.132.239:52620] PHP Fatal error:  Uncaught Error: Call to undefined function xml_parser_create() in /var/www/carpapp/inc/classes/BxDolXmlParser.php:137\nStack trace:\n#0 /var/www/carpapp/install/classes/BxDolInstallModulesTools.php(67): BxDolXmlParser->getValues('<?xml version="...', 'string')\n#1 /var/www/carpapp/install/classes/BxDolInstallLang.php(29): BxDolInstallModulesTools->readLanguage(Array)\n#2 /var/www/carpapp/install/classes/BxDolInstallLang.php(35): BxDolInstallLang->__construct('en')\n#3 /var/www/carpapp/install/classes/BxDolInstallLang.php(81): BxDolInstallLang::getInstance('en')\n#4 /var/www/carpapp/install/index.php(49): require_once('/var/www/carpap...')\n#5 {main}\n  thrown in /var/www/carpapp/inc/classes/BxDolXmlParser.php on line 137, referer: *domain*