apache error

[Sun May 23 01:57:30.890496 2021] [php7:error] [pid 18280] [client 84.148.241.89:58569] PHP Fatal error:  Uncaught Error: Class 'Nextcloud\\LogNormalizer\\Normalizer' not found in /var/www/html/cloud/lib/private/Log.php:89\nStack trace:\n#0 /var/www/html/cloud/lib/private/Server.php(750): OC\\Log->__construct(Object(OC\\Log\\File), Object(OC\\SystemConfig), NULL, Object(OC\\Support\\CrashReport\\Registry))\n#1 /var/www/html/cloud/lib/private/AppFramework/Utility/SimpleContainer.php(155): OC\\Server->OC\\{closure}(Object(OC\\Server))\n#2 /var/www/html/cloud/3rdparty/pimple/pimple/src/Pimple/Container.php(118): OC\\AppFramework\\Utility\\SimpleContainer->OC\\AppFramework\\Utility\\{closure}(Object(Pimple\\Container))\n#3 /var/www/html/cloud/lib/private/AppFramework/Utility/SimpleContainer.php(122): Pimple\\Container->offsetGet('OC\\\\Log')\n#4 /var/www/html/cloud/lib/private/ServerContainer.php(137): OC\\AppFramework\\Utility\\SimpleContainer->query('OC\\\\Log', false)\n#5 /var/www/html/cloud/lib/private/AppFramework/Utility/SimpleContainer.php(56): OC\\ServerContainer->query('OC\\\\Log')\n#6 /var/www/html/cloud/lib/private/AppFramework/Utility/SimpleC in /var/www/html/cloud/lib/private/Log.php on line 89
[Sun May 23 01:59:00.010676 2021] [php7:error] [pid 18281] [client 84.148.241.89:58607] PHP Fatal error:  Uncaught Error: Call to a member function getRequest() on null in /var/www/html/cloud/remote.php:53\nStack trace:\n#0 /var/www/html/cloud/remote.php(171): handleException(Object(Error))\n#1 {main}\n  thrown in /var/www/html/cloud/remote.php on line 53