A Warning Message is a given error if the player tries to play Happy Aquarium. Here is a list:
Lost Internet[]
If the game isn't loading or when in-game, the game gives you a warning that there's no internet by saying "Oops!". You can refresh to try again or support to CrowdStar. If you click X, the game will be active. The makers said that the game will quit if you click on the X, unlike in Happy Pets, but it was removed.