使用MVC 5注册UnityPerRequestHttpModule时出现异常

I use Unity3 with MVC5, and need per request life time manager. However, when I launch the web app, I got server error saying "Cannot register a module after the application has been initialized." The problem is caused by the DynamicModuleUtility. How to solve this problem?I use Unity3 with MVC5, and need per request li