Windows phone 8 emulator debugging doesn't work

Question

Error: a specified communication resource (port) is already in use by another application

• This happens only on the Hyper-V emulator, old, 7.1 emulator works fine.
• Deployment from Blend 2012 works fine.
• Deleting the virtual machines in Hyper-V manager doesn't help
• Deleting the %user%\AppData\Local\Microsoft\Phone Tools\CoreCon doesn't help

My output is:

1>------ Deploy started: Project: Proj1, Configuration: Debug Any CPU ------
1>Deploying C:\Users\Валентин\Projects\Proj1\Bin\Debug\Proj1.xap...
1>Connecting to Emulator WVGA 512MB...
1>The application is already installed on the device. Checking if an incremental deployment is possible...
1>Doing incremental deployment...
1>Updating information related to modified files...
1>Deployment of C:\Users\Валентин\Projects\Proj1\Bin\Debug\Proj1.xap succeeded.
========== Deploy: 1 succeeded, 0 failed, 0 skipped ==========

Last status bar message:

Launching TaskHost.exe failed 

I'm using VS2012 express for WP, WP 7.1 project on WP8 emulator, Windows 8 64 bit.

The curious part is that it worked fine earlier, but for some reason stopped working today.

Please share your ideas.

Answer 1

I had this occurring when trying to debug the app on my device. I fixed it by uninstalling the app and redeploying it.

Answer 2

There is a workaround:

Right click on your project and select Deploy. This will copy all necessary code to the emulator. After that you are free to hit F5 like normal.

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Original article http://blog.masterdevs.com/a-specified-communication-resource-port-is-already-in-use-by-another-application/. Thanks Josh.