/Worlds help

I’m using EssentialCMDS, but whenever i try to create a world using stuff like /createworld and etc it says there was a problem with creating the server properties.

/createworld Survival overworld overworld survival peaceful
“The world properties could not be created”

Well the error is being sent from this line, meaning that this is returning false, and sponge is having difficulty creating the world properties here.

The only thing I can think of is if you have two worlds with the same name…

I’ve tried it with other random names though