“A specified communication resources(port) is already in use” when attaching the debugger

Question

I have just upgrade my windows phone 8 to windows phone 8.1. When I connect my phone to pc and run my project it gives me

Answer 1

1. Close VS
2. Delete the files from C:\Users\Luke\AppData\Local\Microsoft\Phone Tools\CoreCon
3. Open VS and hopefully you can deploy

Source: @Stadler (https://connect.microsoft.com/VisualStudio/feedback/details/772570/wp8-emulator-a-specified-communication-resource-port-is-already-in-use-by-another-application)