These kinds of problems are often due to some files not downloading correctly when the game is installed or updated. We've found that uninstalling and redownloading the game using a strong, reliable internet connection will usually clear these sorts of problems up. If you can do that it might work for you.
However, before you uninstall please make sure you are not using a guest account as you will lose all your data. Please make sure to LINK your account to either Facebook, Google, LINE or Email.