Hi, I have a multiworld server with 8 plugins, I wanted a flat world so I clicked Servers > exampleserver9 > Worlds > Generate world, then
Name (level-name): Lobby
Seed (level-seed): -365
Generator (generator-settings): [Blank]
Worldtype (level-type): FLAT
Hardcore (hardcore): false
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But when I start the server it shows Server crashed, and when I open the log, it shows:
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But I have entered:
And when I check generate world, it shows:
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Is a bug or Is it because today (20/2/2022) the site is under investigation? Please help me 
Plus, I play on iPad not PC
