Hello, I am trying to make a custom kingdom, following the guide found here, I know it's a bit outdated.
So, my problem is this: whenever I choose the scenario where I added this kingdom, it gives me this error (it also has several other errors but lets solve this one first):
If anyone has any idea what I should do and what causes this, please feel free to do so.
So, my problem is this: whenever I choose the scenario where I added this kingdom, it gives me this error (it also has several other errors but lets solve this one first):

If anyone has any idea what I should do and what causes this, please feel free to do so.