“A specified communication resources(port) is alre

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

a specified communication resources(port) is already in use by another application.

I restarted my PC and Phone, removed all connected external devices but still getting same error while running my code through Visual Studio 2012.

I can see it's deployed on phone but I can't debug it. Debugger is not attaching.

Here is my screen shot:

Answer 1

We need to update visual studio 2012

Go to Tools->Extensions and update->updates and update the visual studio update 4

Answer 2

I had exactly the same problem. In my case installing Update 4 RTM for VS 2012 helped and I could once again debug my apps (previously, I had Update 4 RC installed). However, the error still appears if I open VS 2012 and VS 2013 side by side - if only one of them is open at the time then the error won't pop up.

Updating to Vs2012 Update 4 RTM, then we can debug on Phone