App Installation problems Sony KD-55XE8577

[pbos50]

Trying to install an app. I've managed to download it via ES File manager OK, but, when I go to install it, on pressing on Install, a message comes up App not installed in a triangle with an exclamation mark. Very frustrated, so, any help would be appreciated. Cheers guys. 

[Marino.Manolo]

?

Manolo