There is a known issue where it returns error in case the machine name include invalid characters such as
/\":;|<>+=,?* _ .
What's your device name? Please should not include above invalid characters in your machine name.
Here is another similar thread
http://social.msdn.microsoft.com/Forums/en-US/winappswithnativecode/thread/6d8369dd-efde-4392-be48-1e4ca748abc3 for your reference.
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