World doesn't want to load after restart, using a custom modpack

[NyxMinx]

So, me and my friend are playing on 1.19.2 using a custom modpack with essential mod in because we don't want to pay for hosting (nor can we). At first, when creating a world it tells me "Data pack validation failed!" with the options to "Go back" or "Reset to default", and by pressing reset to default it loads my world correctly with all the mods it has installed. When I leave and try to get on the world again however, it tells me “Errors in currently selected data packs prevented the world from loading. You can either try to load it with only the vanilla data pack (“safe mode”) or go back to the title screen and fix it manually” and I'm not sure how to fix it manually. After checking the output logs I saw that parent kotlin is missing but it didn't fix anything which is weird, if needed I can provide the output logs.