For the application to be installed on the Apple TV, you need to make sure that the Apple TV is version 2 (eg. Apple TV 2) and the jailbroken technique is applied correctly. Luckily for you, there are step by step guides that provide all the necessary information related to the actual installation. I recommend checking Google Search then browse to the OhGuideMe website. There is a vast tutorial which explains all the necessary procedure to root the Apple TV properly to install Nito and XBMC on your TV.
