iPhone : Device Token Inactive in Urban Airship

I am getting following error message on Urban Airship.

     Apple Push service rejected device token 38A69702F555A3B17F73FB4DB835C0E5 AD31ED987030202AADF45C5170C9EFDC.
     Original Message: {"aps":{"sound":"cat.caf","badge":4,"alert":"This is Test Message."}} 

And It is showing Status as INACTIVE for this particular Device Token.

What could be wrong ?

The most common occurrence for rejected device tokens is sending a development device token to an ad-hoc/production app setup, or vice-versa.