Visual Studio Error

When I try to run an ASP.Net Web Application I get the following error.  What is the cause of this?  How do I fix?  This is happening with all of my projects.


Server Error in '/' Application.

Specified argument was out of the range of valid values.
Parameter name: site
  Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

 Exception Details: System.ArgumentOutOfRangeException: Specified argument was out of the range of valid values.
Parameter name: site

Source Error:


 An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.  

Stack Trace:



[ArgumentOutOfRangeException: Specified argument was out of the range of valid values.
Parameter name: site]
   System.Web.HttpRuntime.HostingInit(HostingEnvironmentFlags hostingFlags, PolicyLevel policyLevel, Exception appDomainCreationException) +280

[HttpException (0x80004005): Specified argument was out of the range of valid values.
Parameter name: site]
   System.Web.HttpRuntime.FirstRequestInit(HttpContext context) +10042604
   System.Web.HttpRuntime.EnsureFirstRequestInit(HttpContext context) +95
   System.Web.HttpRuntime.ProcessRequestNotificationPrivate(IIS7WorkerRequest wr, HttpContext context) +254

 


Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.7.2556.0