Fatal error: Cannot use 'String' as class name as it is reserved in /home/riversof/public_html/lib/Cake/Utility/String.php on line 27

Fatal error: Uncaught Error: Class 'String' not found in /home/riversof/public_html/lib/Cake/Utility/Debugger.php:342 Stack trace: #0 /home/riversof/public_html/lib/Cake/Utility/Debugger.php(747): Debugger::trace(Array) #1 /home/riversof/public_html/lib/Cake/Error/ErrorHandler.php(200): Debugger->outputError(Array) #2 [internal function]: ErrorHandler::handleError(8, 'SplFileObject::...', '/home/riversof/...', 144, Array) #3 /home/riversof/public_html/lib/Cake/Cache/Engine/FileEngine.php(144): SplFileObject->fwrite('1728747753\na:15...') #4 /home/riversof/public_html/lib/Cake/Cache/Cache.php(299): FileEngine->write('myapp_cake_core...', 'a:15:{s:9:"Conf...', 10) #5 /home/riversof/public_html/lib/Cake/Core/App.php(895): Cache::write('file_map', Array, '_cake_core_') #6 [internal function]: App::shutdown() #7 {main} thrown in /home/riversof/public_html/lib/Cake/Utility/Debugger.php on line 342