What does 'infinite yield possible' mean in roblox studio output?

It means a WaitForChild call has been waiting for more than 5 seconds and still hasn't found what it's looking for. It's a warning, not an error, and the script just keeps waiting forever. Usually the name is spelled wrong, the object is under a different parent than you think, or it only exists on the server and you're waiting from a client script. Check the exact path in the explorer while the game is running.