Cannot add new pages with PHP 8

hi there
i am using concrete version 9.2.1 and on the first glimpse it looked perfect.
but then i wanted to add a new page and got this error message (with php 7.4 it still works well):

/home/kirmesma/www/staging.mywebsite.com/updates/concrete-cms-9.2.1/concrete/attributes/date_time/controller.php(143): Whoops\Exception\ErrorException->null
/home/kirmesma/www/staging.mywebsite.com/updates/concrete-cms-9.2.1/concrete/attributes/date_time/controller.php(143): Whoops\Run->handleError
/home/kirmesma/www/staging.mywebsite.com/updates/concrete-cms-9.2.1/concrete/src/Attribute/StandardValidator.php(39): Concrete\Attribute\DateTime\Controller->validateForm
/home/kirmesma/www/staging.mywebsite.com/updates/concrete-cms-9.2.1/concrete/src/Page/Type/Composer/Control/CollectionAttributeControl.php(191): Concrete\Core\Attribute\StandardValidator->validateSaveValueRequest
/home/kirmesma/www/staging.mywebsite.com/updates/concrete-cms-9.2.1/concrete/src/Page/Type/Validator/StandardValidator.php(93): Concrete\Core\Page\Type\Composer\Control\CollectionAttributeControl->validate
/home/kirmesma/www/staging.mywebsite.com/updates/concrete-cms-9.2.1/concrete/controllers/dialog/page/add/compose.php(76): Concrete\Core\Page\Type\Validator\StandardValidator->validatePublishDraftRequest
/home/kirmesma/www/staging.mywebsite.com/updates/concrete-cms-9.2.1/concrete/src/Controller/AbstractController.php(318): Concrete\Controller\Dialog\Page\Add\Compose->submit
/home/kirmesma/www/staging.mywebsite.com/updates/concrete-cms-9.2.1/concrete/src/Controller/AbstractController.php(318): null->call_user_func_array
/home/kirmesma/www/staging.mywebsite.com/updates/concrete-cms-9.2.1/concrete/src/Routing/ControllerRouteAction.php(64): Concrete\Core\Controller\AbstractController->runAction
/home/kirmesma/www/staging.mywebsite.com/updates/concrete-cms-9.2.1/concrete/src/Http/RouteDispatcher.php(37): Concrete\Core\Routing\ControllerRouteAction->execute
/home/kirmesma/www/staging.mywebsite.com/updates/concrete-cms-9.2.1/concrete/src/Http/Middleware/DispatcherDelegate.php(39): Concrete\Core\Http\RouteDispatcher->dispatch
/home/kirmesma/www/staging.mywebsite.com/updates/concrete-cms-9.2.1/concrete/src/Http/Middleware/MiddlewareStack.php(86): Concrete\Core\Http\Middleware\DispatcherDelegate->next
/home/kirmesma/www/staging.mywebsite.com/updates/concrete-cms-9.2.1/concrete/src/Http/DefaultDispatcher.php(127): Concrete\Core\Http\Middleware\MiddlewareStack->process
/home/kirmesma/www/staging.mywebsite.com/updates/concrete-cms-9.2.1/concrete/src/Http/DefaultDispatcher.php(60): Concrete\Core\Http\DefaultDispatcher->handleDispatch
/home/kirmesma/www/staging.mywebsite.com/updates/concrete-cms-9.2.1/concrete/src/Http/Middleware/DispatcherDelegate.php(39): Concrete\Core\Http\DefaultDispatcher->dispatch
/home/kirmesma/www/staging.mywebsite.com/updates/concrete-cms-9.2.1/concrete/src/Http/Middleware/FrameOptionsMiddleware.php(39): Concrete\Core\Http\Middleware\DispatcherDelegate->next
/home/kirmesma/www/staging.mywebsite.com/updates/concrete-cms-9.2.1/concrete/src/Http/Middleware/MiddlewareDelegate.php(50): Concrete\Core\Http\Middleware\FrameOptionsMiddleware->process
/home/kirmesma/www/staging.mywebsite.com/updates/concrete-cms-9.2.1/concrete/src/Http/Middleware/StrictTransportSecurityMiddleware.php(36): Concrete\Core\Http\Middleware\MiddlewareDelegate->next
/home/kirmesma/www/staging.mywebsite.com/updates/concrete-cms-9.2.1/concrete/src/Http/Middleware/MiddlewareDelegate.php(50): Concrete\Core\Http\Middleware\StrictTransportSecurityMiddleware->process
/home/kirmesma/www/staging.mywebsite.com/updates/concrete-cms-9.2.1/concrete/src/Http/Middleware/ContentSecurityPolicyMiddleware.php(36): Concrete\Core\Http\Middleware\MiddlewareDelegate->next
/home/kirmesma/www/staging.mywebsite.com/updates/concrete-cms-9.2.1/concrete/src/Http/Middleware/MiddlewareDelegate.php(50): Concrete\Core\Http\Middleware\ContentSecurityPolicyMiddleware->process
/home/kirmesma/www/staging.mywebsite.com/updates/concrete-cms-9.2.1/concrete/src/Http/Middleware/CookieMiddleware.php(35): Concrete\Core\Http\Middleware\MiddlewareDelegate->next
/home/kirmesma/www/staging.mywebsite.com/updates/concrete-cms-9.2.1/concrete/src/Http/Middleware/MiddlewareDelegate.php(50): Concrete\Core\Http\Middleware\CookieMiddleware->process
/home/kirmesma/www/staging.mywebsite.com/updates/concrete-cms-9.2.1/concrete/src/Http/Middleware/ApplicationMiddleware.php(29): Concrete\Core\Http\Middleware\MiddlewareDelegate->next
/home/kirmesma/www/staging.mywebsite.com/updates/concrete-cms-9.2.1/concrete/src/Http/Middleware/MiddlewareDelegate.php(50): Concrete\Core\Http\Middleware\ApplicationMiddleware->process
/home/kirmesma/www/staging.mywebsite.com/updates/concrete-cms-9.2.1/concrete/src/Http/Middleware/MiddlewareStack.php(86): Concrete\Core\Http\Middleware\MiddlewareDelegate->next
/home/kirmesma/www/staging.mywebsite.com/updates/concrete-cms-9.2.1/concrete/src/Http/DefaultServer.php(85): Concrete\Core\Http\Middleware\MiddlewareStack->process
/home/kirmesma/www/staging.mywebsite.com/updates/concrete-cms-9.2.1/concrete/src/Foundation/Runtime/Run/DefaultRunner.php(128): Concrete\Core\Http\DefaultServer->handleRequest
/home/kirmesma/www/staging.mywebsite.com/updates/concrete-cms-9.2.1/concrete/src/Foundation/Runtime/DefaultRuntime.php(102): Concrete\Core\Foundation\Runtime\Run\DefaultRunner->run
/home/kirmesma/www/staging.mywebsite.com/updates/concrete-cms-9.2.1/concrete/dispatcher.php(45): Concrete\Core\Foundation\Runtime\DefaultRuntime->run
/home/kirmesma/www/staging.mywebsite.com/concrete/bootstrap/configure.php(55): null->require
/home/kirmesma/www/staging.mywebsite.com/concrete/dispatcher.php(13): null->require
/home/kirmesma/www/staging.mywebsite.com/index.php(2): null->require

anyone any idea how to solve this?

thank you very much!

Hi @eivissa89 - is this a fresh install? Maybe if you can give us an environment dump or something we can troubleshoot a little better but hard to tell from just the error.