General Questions/New to Joomla! 4.x • HTTP 500 error

Code:

Symfony\Component\ErrorHandler\Error\ClassNotFoundError:Attempted to load class "TemplatesComponent" from namespace "Joomla\Component\Templates\Administrator\Extension".Did you forget a "use" statement for another namespace?  at /mnt/web011/d1/90/53596690/htdocs/administrator/components/com_templates/services/provider.php:46  at Joomla\DI\ServiceProviderInterface@anonymous/mnt/web011/d1/90/53596690/htdocs/administrator/components/com_templates/services/provider.php:28$70->{closure}()     (/mnt/web011/d1/90/53596690/htdocs/libraries/vendor/joomla/di/src/ContainerResource.php:182)  at Joomla\DI\ContainerResource->getInstance()     (/mnt/web011/d1/90/53596690/htdocs/libraries/vendor/joomla/di/src/Container.php:96)  at Joomla\DI\Container->get()     (/mnt/web011/d1/90/53596690/htdocs/libraries/src/Extension/ExtensionManagerTrait.php:177)  at Joomla\CMS\Application\CMSApplication->loadExtension()     (/mnt/web011/d1/90/53596690/htdocs/libraries/src/Extension/ExtensionManagerTrait.php:51)  at Joomla\CMS\Application\CMSApplication->bootComponent()     (/mnt/web011/d1/90/53596690/htdocs/libraries/src/Application/AdministratorApplication.php:233)  at Joomla\CMS\Application\AdministratorApplication->getTemplate()     (/mnt/web011/d1/90/53596690/htdocs/libraries/src/Error/Renderer/HtmlRenderer.php:50)  at Joomla\CMS\Error\Renderer\HtmlRenderer->render()     (/mnt/web011/d1/90/53596690/htdocs/libraries/src/Exception/ExceptionHandler.php:126)  at Joomla\CMS\Exception\ExceptionHandler::render()     (/mnt/web011/d1/90/53596690/htdocs/libraries/src/Exception/ExceptionHandler.php:72)  at Joomla\CMS\Exception\ExceptionHandler::handleException()     (/mnt/web011/d1/90/53596690/htdocs/libraries/src/Application/CMSApplication.php:322)  at Joomla\CMS\Application\CMSApplication->execute()     (/mnt/web011/d1/90/53596690/htdocs/administrator/includes/app.php:61)  at require_once('/mnt/web011/d1/90/53596690/htdocs/administrator/includes/app.php')     (/mnt/web011/d1/90/53596690/htdocs/administrator/index.php:32)