IIS 0x80070020 error

I am trying to start up a web app with visual studio, and I keep getting the error:

The process cannot access the file because it is being used by another process. (Exception from HRESULT: 0x80070020).

I did some digging and i found that port 80 was used by the actual System proccess(lol) so i changed the default web site port from IIs manager to something that is not used by anything. I am still getting the error though.

One thing to note is that I can fire up a new website project but not a web application.

Windows 10.

Thanks

some application (check Skype connection port setting) can block ports

or use console:

netstat -aon | find «:80» netstat -aon | find «:443»