My iPhone always says that it's not a valid app?

I downloaded an app from apptrackr from my computer and put it on iTunes, after I sync the apps and iTunes is done a message pops up on my iPhone saying that the app couldn't be installed because its not a valid app

Is your iPhone jailbroke? If its not this is the reason

Any app put onto the iPhone/iPad/iPod must be "Apple-compatible", meaning it has to have an iOS version of it. The only iOS apps are found on the App Store. Therefore, the app you downloaded was not meant for the iPhone/iPad/iPod to begin with.

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