When you’re coding your Metro app application using Dev11, you can see this exception when you have invalid characters in the path. But it’s not only caused by this. This can be also caused right after you move your solution folder (and the projects) to a different folder, you open it again, you try to run it from the new location but you forgot to uninstall the Metro app deployed from the previous location.
To fix this issue, you just need to go to the Start page, and uninstall the Metro app that you’ve moved. That should fix the issue immediately, and you will be able to deploy the app from the new location…
I hope you find it useful!