Please try restarting Animal Crossing: Pocket Camp.
Note: Please take care that you do not uninstall or delete the Animal Crossing: Pocket Camp game from your device by mistake.
If that still doesn't help, you can try the following steps to clear and reacquire data for the game:
❶ On the title screen, select the menu in the top-left corner.
❷ Select Data Restore to reacquire data.