What happend
php version: 8.1
Deprecated: DateTime::__construct(): Passing null to parameter #1 ($datetime) of type string is deprecated in /www/wwwroot/flarum/vendor/v17development/flarum-seo/src/Managers/Tag.php on line 48
Fatal error: Uncaught Laminas\HttpHandlerRunner\Exception\EmitterException: Output has been emitted previously; cannot emit response in /www/wwwroot/flarum/vendor/laminas/laminas-httphandlerrunner/src/Exception/EmitterException.php:20 Stack trace: #0 /www/wwwroot/flarum/vendor/laminas/laminas-httphandlerrunner/src/Emitter/SapiEmitterTrait.php(42): Laminas\HttpHandlerRunner\Exception\EmitterException::forOutputSent() #1 /www/wwwroot/flarum/vendor/laminas/laminas-httphandlerrunner/src/Emitter/SapiEmitter.php(21): Laminas\HttpHandlerRunner\Emitter\SapiEmitter->assertNoPreviousOutput() #2 /www/wwwroot/flarum/vendor/laminas/laminas-httphandlerrunner/src/RequestHandlerRunner.php(75): Laminas\HttpHandlerRunner\Emitter\SapiEmitter->emit() #3 /www/wwwroot/flarum/vendor/flarum/core/src/Http/Server.php(45): Laminas\HttpHandlerRunner\RequestHandlerRunner->run() #4 /www/wwwroot/flarum/public/index.php(26): Flarum\Http\Server->listen() #5 {main} thrown in /www/wwwroot/flarum/vendor/laminas/laminas-httphandlerrunner/src/Exception/EmitterException.php on line 20