Fatal error: Cannot use 'String' as class name as it is reserved in /customers/c/2/5/volleytransfers.be/httpd.www/lib/Cake/Utility/String.php on line 27

Fatal error: Uncaught Error: Class 'String' not found in /customers/c/2/5/volleytransfers.be/httpd.www/lib/Cake/Utility/Debugger.php:342
Stack trace:
#0 /customers/c/2/5/volleytransfers.be/httpd.www/lib/Cake/Error/ErrorHandler.php(225): Debugger::trace(Array)
#1 /customers/c/2/5/volleytransfers.be/httpd.www/lib/Cake/View/View.php(937): ErrorHandler::handleError(2, 'include(/custom...', '/customers/c/2/...', 937, Array)
#2 /customers/c/2/5/volleytransfers.be/httpd.www/lib/Cake/View/View.php(937): include()
#3 /customers/c/2/5/volleytransfers.be/httpd.www/lib/Cake/View/View.php(899): View->_evaluate('/customers/c/2/...', Array)
#4 /customers/c/2/5/volleytransfers.be/httpd.www/lib/Cake/View/View.php(531): View->_render('/customers/c/2/...')
#5 /customers/c/2/5/volleytransfers.be/httpd.www/lib/Cake/View/View.php(470): View->renderLayout('<h2>An Internal...', 'default')
#6 /customers/c/2/5/volleytransfers.be/httpd.www/lib/Cake/Controller/Controller.php(952): View->render('error500', 'default')
#7 /customers/c/2/5/volleytransfe in /customers/c/2/5/volleytransfers.be/httpd.www/lib/Cake/Utility/Debugger.php on line 342