Fatal error: Uncaught Error: Class 'TYPO3\CMS\Fluid\ViewHelpers\IfViewHelper' not found in /var/www/typo-data/typo3conf/ext/community/Classes/ViewHelpers/UnreadMessagesViewHelper.php:38 Stack trace: #0 /var/www/var/www/typo3/typo3_src-9.5.24/vendor/composer/ClassLoader.php(444): include() #1 /var/www/var/www/typo3/typo3_src-9.5.24/vendor/composer/ClassLoader.php(322): Composer\Autoload\includeFile() #2 /var/www/var/www/typo3/typo3_src-9.5.24/vendor/typo3/class-alias-loader/src/ClassAliasLoader.php(135): Composer\Autoload\ClassLoader->loadClass() #3 /var/www/var/www/typo3/typo3_src-9.5.24/vendor/typo3/class-alias-loader/src/ClassAliasLoader.php(123): TYPO3\ClassAliasLoader\ClassAliasLoader->loadClass() #4 [internal function]: TYPO3\ClassAliasLoader\ClassAliasLoader->loadClassWithAlias() #5 [internal function]: spl_autoload_call() #6 /var/www/var/www/typo3/typo3_src-9.5.24/vendor/typo3fluid/fluid/src/Core/ViewHelper/ViewHelperResolver.php(329): class_exists() #7 /var/www/var/www/typo3/typo3_src-9.5.24/vendor/typo3fluid/flui in /var/www/typo-data/typo3conf/ext/community/Classes/ViewHelpers/UnreadMessagesViewHelper.php on line 38