Fatal error: Cannot use 'String' as class name as it is reserved in /var/www/vhosts/lessonassistant.com/httpdocs/lib/Cake/Utility/String.php on line 24

Fatal error: Uncaught Error: Class 'String' not found in /var/www/vhosts/lessonassistant.com/httpdocs/lib/Cake/Utility/Debugger.php:340 Stack trace: #0 /var/www/vhosts/lessonassistant.com/httpdocs/lib/Cake/Utility/Debugger.php(742): Debugger::trace() #1 /var/www/vhosts/lessonassistant.com/httpdocs/lib/Cake/Error/ErrorHandler.php(219): Debugger->outputError() #2 [internal function]: ErrorHandler::handleError() #3 /var/www/vhosts/lessonassistant.com/httpdocs/lib/Cake/Log/Engine/FileLog.php(142): file_put_contents() #4 /var/www/vhosts/lessonassistant.com/httpdocs/lib/Cake/Log/CakeLog.php(442): FileLog->write() #5 /var/www/vhosts/lessonassistant.com/httpdocs/lib/Cake/Error/ErrorHandler.php(240): CakeLog::write() #6 /var/www/vhosts/lessonassistant.com/httpdocs/lib/Cake/Error/ErrorHandler.php(203): ErrorHandler::handleFatalError() #7 /var/www/vhosts/lessonassistant.com/httpdocs/lib/Cake/Core/App.php(931): ErrorHandler::handleError() #8 /var/www/vhosts/lessonassistant.com/httpdocs/lib/Cake/Core/App.php(904): App::_checkFatalErro in /var/www/vhosts/lessonassistant.com/httpdocs/lib/Cake/Utility/Debugger.php on line 340