A default document is not configured for the requested URL, and directory browsing is not enabled on the server
Solution 1:
Which version of IIS is your host running? One thing to try is to put a dummy default.aspx file in the root folder (this will not be used when MVC is working, but can get rid of this problem).
Solution 2:
The answer marked will help you eliminate the error but it will not get MVC working. The answer to the problem is to add this line to the web.config file in system.webServer:
<modules runAllManagedModulesForAllRequests="true" />