Fatal error: Cannot use 'String' as class name as it is reserved in /home1/citavimx/old/lib/Cake/Utility/String.php on line 24

Fatal error: Uncaught Error: Class 'String' not found in /home1/citavimx/old/lib/Cake/Utility/Debugger.php:340 Stack trace: #0 /home1/citavimx/old/lib/Cake/Utility/Debugger.php(742): Debugger::trace(Array) #1 /home1/citavimx/old/lib/Cake/Error/ErrorHandler.php(219): Debugger->outputError(Array) #2 [internal function]: ErrorHandler::handleError(2, 'Cannot modify h...', '/home1/citavimx...', 360, Array) #3 /home1/citavimx/old/app/Controller/AppController.php(360): header('Cache-Control: ...') #4 /home1/citavimx/old/lib/Cake/Event/CakeEventManager.php(242): AppController->beforeFilter(Object(CakeEvent)) #5 /home1/citavimx/old/lib/Cake/Controller/Controller.php(674): CakeEventManager->dispatch(Object(CakeEvent)) #6 /home1/citavimx/old/lib/Cake/Error/ExceptionRenderer.php(155): Controller->startupProcess() #7 /home1/citavimx/old/lib/Cake/Error/ExceptionRenderer.php(92): ExceptionRenderer->_getController(Object(FatalErrorException)) #8 /home1/citavimx/old/lib/Cake/Error/ErrorHandler.php(118): ExceptionRenderer->__construct(Obje in /home1/citavimx/old/lib/Cake/Utility/Debugger.php on line 340