xasharma A couple of issues here.
[27-Jun-2021 08:11:50 UTC] PHP Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 524288 bytes) in /home/hacksnat/public_html/storage/less/lessphp_nmoazm2o2j4cw8owkgw0csscckgw8sc.lesscache on line 3
[27-Jun-2021 08:25:35 UTC] PHP Fatal error: Uncaught Error: Class 'Flarum\Flags\Flag' not found in /home/hacksnat/public_html/vendor/kilowhat/flarum-ext-audit-free/src/Extenders/FlarumFlagsEvents.php:17
Stack trace:
#0 /home/hacksnat/public_html/vendor/flarum/core/src/Extension/Extension.php(140): Kilowhat\Audit\Extenders\FlarumFlagsEvents->extend(Object(Illuminate\Container\Container), Object(Flarum\Extension\Extension))
#1 /home/hacksnat/public_html/vendor/flarum/core/src/Extension/ExtensionManager.php(364): Flarum\Extension\Extension->extend(Object(Illuminate\Container\Container))
#2 /home/hacksnat/public_html/vendor/flarum/core/src/Extension/ExtensionServiceProvider.php(31): Flarum\Extension\ExtensionManager->extend(Object(Illuminate\Container\Container))
#3 [internal function]: Flarum\Extension\ExtensionServiceProvider->Flarum\Extension\{closure}(Object(Flarum\Foundation\Application))
#4 /home/hacksnat/public_html/vendor/flarum/core/src/Foundation/Application.php(329): call_user_func(Object(Closure), Object(Flarum\Foundation\Application))
#5 /home in /home/hacksnat/public_html/vendor/flarum/core/src/Extension/Extension.php on line 142
The first is that not enough memory appears to be allocated to PHP, and the second issue stems from kilowhat/flarum-ext-audit-free. Can you try to uninstall that extension, clear the cache, and let me know if the problem subsides ?