Thank you for quick answer. I can do everything except upgrading - I will loose all booster and gold. First I need to use them all. Restarting phone didn't help. I can leave with that crushing. This may be extra challenge. 😎
Boosters are not lost due to updating game app and it is mandatory to keep the game app updated to play the game smoothly. If your game app is not already updated, try update the game app and see if your problem is solved.