Problems with adding a new encounter method

I can't understand it. I'm trying to add a new Encounter Method, but am getting an error for doing so. This is so frustrating, it is impossible to calm down.

Message: Undefined encounter type (New Method Name), expected one of the following:

["Land", "Cave", "Water", "RockSmash", "OldRod", "GoodRod", "SuperRod", "HeadbuttLow", "HeadbuttHigh", "LandMorning", "LandDay", "LandNight", "BugContest"]

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I did everything in this tutorial, but WHY IS IT REFUSING TO RECOGNIZE IT?!?!?!?!?!!??!

What is your new encounter type? All I see is the default ones in Essentials. Can we see the whole error message please

Apparently, you didn't do everything in the tutorial, else it would've worked. Why don't you show us your code instead? Maybe we can spot something you missed.