Fatal error: Uncaught Error: Class 'TYPO3\CMS\Frontend\Middleware\PreviewSimulator' not found in /usr/www/users/hsdl39/typo3/typo3_src-9.5.13/typo3/sysext/core/Classes/Utility/GeneralUtility.php:3675 Stack trace: #0 /usr/www/users/hsdl39/typo3/typo3_src-9.5.13/typo3/sysext/core/Classes/Http/MiddlewareDispatcher.php(133): TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance('TYPO3\\CMS\\Front...') #1 /usr/www/users/hsdl39/typo3/typo3_src-9.5.13/typo3/sysext/adminpanel/Classes/Middleware/AdminPanelInitiator.php(58): class@anonymous->handle(Object(TYPO3\CMS\Core\Http\ServerRequest)) #2 /usr/www/users/hsdl39/typo3/typo3_src-9.5.13/typo3/sysext/core/Classes/Http/MiddlewareDispatcher.php(138): TYPO3\CMS\Adminpanel\Middleware\AdminPanelInitiator->process(Object(TYPO3\CMS\Core\Http\ServerRequest), Object(class@anonymous)) #3 /usr/www/users/hsdl39/typo3/typo3_src-9.5.13/typo3/sysext/frontend/Classes/Middleware/SiteResolver.php(68): class@anonymous->handle(Object(TYPO3\CMS\Core\Http\ServerRequest)) #4 /usr/www/users/hsdl39/typo3/typ in /usr/www/users/hsdl39/typo3/typo3_src-9.5.13/typo3/sysext/core/Classes/Utility/GeneralUtility.php on line 3675