Worlds get deleted

I am using Multiverse-Core in order to have multiple worlds at once... I created a world named Admin and it appears just fine. Then I stop the server, upload a custom map (zip file) to the new world and start the server again. But the new map gets deleted, this is what the logs say:

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[02:55:04] [Server thread/WARN]: [Multiverse-Core] Use '/mv remove' to remove it from the config!
[02:55:04] [Server thread/WARN]: [Multiverse-Core] WorldManager: Can't load this world because the folder was deleted/moved: Admin

How can I prevent the server from deleting this new map on each "Start/Stop"

PS: I think this thread should be in the "Modpack" category, a bit too late. Any help is highly appreciated.

Re-created the world in-game, stopped the server and uploaded my custom map.

If I start it again it will probably delete the new world so yeah I'll leave it to you now.

PS: The custom world is called "Admin"

Okay, let me know when it's fixed.
Thanks

Now I can't seem to be able to create the world. I created Admin in-game, but the server crashed before the world is created and now Logs detected a problem after I try to start the server again.

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The world 'Admin' could not be loaded because it contains errors and is probably corrupt.

It gives me the option to Delete the world but it does absolutely nothing when I click the "tick" box (with the server closed of course)

PS: I deleted the world files stored in the "WorldGuard" Folder... I'll try again.

It works, thank you for the help.