Fatal error: Cannot use 'String' as class name as it is reserved in /app/lib/Cake/Utility/String.php on line 26

Fatal error: Uncaught Error: Class 'String' not found in /app/lib/Cake/Utility/Debugger.php:343 Stack trace: #0 /app/lib/Cake/Utility/Debugger.php(711): Debugger::trace() #1 /app/lib/Cake/Error/ErrorHandler.php(178): Debugger->outputError() #2 [internal function]: ErrorHandler::handleError() #3 /app/lib/Cake/Log/Engine/FileLog.php(87): file_put_contents() #4 /app/lib/Cake/Log/CakeLog.php(449): FileLog->write() #5 /app/lib/Cake/Error/ErrorHandler.php(200): CakeLog::write() #6 /app/lib/Cake/Error/ErrorHandler.php(162): ErrorHandler::handleFatalError() #7 /app/lib/Cake/Core/App.php(926): ErrorHandler::handleError() #8 /app/lib/Cake/Core/App.php(899): App::_checkFatalError() #9 [internal function]: App::shutdown() #10 {main} thrown in /app/lib/Cake/Utility/Debugger.php on line 343