Exagear rpg and strategies not works :(

[shortlife]

Hello, i am french, i can't play and use exagear, when i open a app, this message :
Problem setting up in app billing : labresult : billing service unavailable on device. (reponse : 3 : billing unavailable)

My apps are 2.6.8 and 3.5.0

Help me please, thank you !

[shortlife]

I resolve the problem, but exagear RPG not works, bug opening and turn off