You will see that what happens is that creatures is for 1.12.2, but the problem is that the custom mob generator does not exist for 1.12.2 that does not allow to enter mo creatures in that version
Please, fix it
Thanks :3 
Custom Mob Spawner For 1.12.2 (Mod Request)
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- Migoska87
- Closed
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Sorry, I don't understand what your problem is?
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Migoska87
Changed the title of the thread from “Custom Mob Spawner For 1.12.2 (Mod Rejection)” to “Custom Mob Spawner For 1.12.2 (Mod Request)”. -
It's available here: https://aternos.org/addons/a/curseforge/custom-mob-spawner
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Roman
Closed the thread.