Multiverse HELP

[AllMightyNick]

 

I see a lot of servers using Multiverse but it doesnt work for me. I can't import a world or create one. It gives an internal error.

Please help or if you know how to get it to work i use BukkitForge.

Thank you! 

 

Screenshots:

That is the command i ran with the result.

This is what happens when I tried to create a world

Command was /mv create SpawnWorld normal -t flat