I am using Windows 8.1 Pro x64. Does anyone know what the **** is going on with this and how i can fix it?
Did you upgrade your phone to WP8.1 or is it still on an 8.0 version? Have you tried reinstalling (or installing a newer copy of) the WP SDK?
Also, I can't translate the exception message, so I really don't know what the problem is aside from the self-explanatory nature of a "DeviceNotFoundException". Can you see the device with other tools (XapDeploy, WPPT, etc.) and for that matter does it show up in Explorer?