Visual Studio 2012: Unable to attach the process. A debugger is already attached

I built solution, created application in IIS and mapped it to the application folder. It works fine. Then I go to “Attach to Process”, there are two w3wp.exe processes in list, but for one of them I get error “Unable to attach the process. A debugger is already attach.” I’ve googled it but I can’t find solution for my problem.

IIS 7.5 Application Initialization for ASP.NET web service (warmup) without remapping requests

I’m trying to use the IIS 7.5 Application Initialization extension to configure a warmup process for my web application. This is an approach I am taking to minimize slow downs caused by application pool recycling, which is a problem explained well in other questions on Stack Overflow.