i deleted the "default" word in the world type and it work, sorry for making the post, it can be deleted now. Thank you for the quick answer 
Posts by Phonka
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I wanted to use the mods:
- Recurrent Complex ( https://aternos.org/addons/a/curseforge/recurrent-complex )-Ruins ( https://aternos.org/addons/a/c…structure-spawning-system )
when i generate a world i cant make it generate using the mods, i readed some forums threads talking about the world type thing, what would i need to type in the world type for those mods?
Thank you