WCF - Error 500.21 Handler "svc-Integrated" has a bad module "ManagedPipelineHandler" in its module list"

If you  see this error you havent installed the prerequistes for ASP.NET 4.

1. Go to C:\Windows\Microsoft.NET\Framework64\v4.0.30319
2. Type the following: 
   1. aspnet_regiis.exe -i
3. Run the command
4. Try your service again...