A datpack that only contains 'pack.mcmeta' isn't a datpack at all, a datapack must've a 'data' folder. Also, if that datapack is for the Bukkit plugins, you can't even use it since you're playing on Forge.
I'm playing at Mohist which is for Plugins and Mods
My server keeps crashing, and the crash is because the Datapack, but the Datapack i only have is pack.mcmeta and it's for Bukkit Plugin, i tried deleting the Datapack File, Generate another World, but it keeps crashing. Here is the log: https://mclo.gs/mitXMRD