symfony2 生产环境报“Oops! An Error Occurred”

Oops! An Error OccurredThe server returned a "404 Not Found".Something is broken. Please e-mail us at [email] and let us know what you were doing when this error occurred. We will fix it as soon as possible. Sorry for any inconvenience caused.

[2014-10-19 12:16:26] request.ERROR: Uncaught PHP Exception Symfony\Component\HttpKernel\Exception\NotFoundHttpException: "No route found for "GET /"" at D:\server\www\symfony\app\cache\prod\classes.php line 1992 {"exception":"[object] (Symfony\\Component\\HttpKernel\\Exception\\NotFoundHttpException: No route found for \"GET /\" at D:\\server\\www\\symfony\\app\\cache\\prod\\classes.php:1992, Symfony\\Component\\Routing\\Exception\\ResourceNotFoundException:  at D:\\server\\www\\symfony\\app\\cache\\prod\\appProdUrlMatcher.php:32)"} []