INFINITY KINGDOM

there are times where you upgrade buildings and then you get to the point of upgrading your wall and it tells you to upgrade your training grounds. You go to upgrade your training grounds and get an error “ Conditions have not been met”, even if you use gems it flashes like you upgraded the item but you did not, even though it spent your gems and still gives you the same error. Then you have to restart your entire game for it work properly. This needs to be fixed.