Sorry for the late reply, as far as I can tell there are no errors on starting Minecraft or loading in a world. Though, when creating a new world, I do get these warnings.
[20:31:53] [Server thread/DEBUG] [ne.mi.fm.co.ConfigFileTypeHandler/CONFIG]: Built TOML config for .\saves\E\serverconfig\forge-server.toml
[20:31:53] [Server thread/DEBUG] [ne.mi.fm.co.ConfigFileTypeHandler/CONFIG]: Loaded TOML config file .\saves\E\serverconfig\forge-server.toml
[20:31:53] [Server thread/DEBUG] [ne.mi.fm.co.ConfigFileTypeHandler/CONFIG]: Watching TOML config file .\saves\E\serverconfig\forge-server.toml for changes
[20:31:53] [Server thread/WARN] [ne.mi.co.ForgeConfigSpec/CORE]: Configuration file .\saves\E\serverconfig\forge-server.toml is not correct. Correcting
[20:31:53] [Server thread/WARN] [ne.mi.co.ForgeConfigSpec/CORE]: Incorrect key server was corrected from null to its default, SimpleCommentedConfig:{}.
[20:31:53] [Server thread/WARN] [ne.mi.co.ForgeConfigSpec/CORE]: Incorrect key server.removeErroringEntities was corrected from null to its default, false.
[20:31:53] [Server thread/DEBUG] [ne.mi.co.ForgeConfigSpec/CORE]: The comment on key server.removeErroringEntities does not match the spec. This may create a backup.
[20:31:53] [Server thread/WARN] [ne.mi.co.ForgeConfigSpec/CORE]: Incorrect key server.removeErroringTileEntities was corrected from null to its default, false.
[20:31:53] [Server thread/DEBUG] [ne.mi.co.ForgeConfigSpec/CORE]: The comment on key server.removeErroringTileEntities does not match the spec. This may create a backup.
[20:31:53] [Server thread/WARN] [ne.mi.co.ForgeConfigSpec/CORE]: Incorrect key server.fullBoundingBoxLadders was corrected from null to its default, false.
[20:31:53] [Server thread/DEBUG] [ne.mi.co.ForgeConfigSpec/CORE]: The comment on key server.fullBoundingBoxLadders does not match the spec. This may create a backup.
[20:31:53] [Server thread/WARN] [ne.mi.co.ForgeConfigSpec/CORE]: Incorrect key server.zombieBaseSummonChance was corrected from null to its default, 0.1.
[20:31:53] [Server thread/DEBUG] [ne.mi.co.ForgeConfigSpec/CORE]: The comment on key server.zombieBaseSummonChance does not match the spec. This may create a backup.
[20:31:53] [Server thread/WARN] [ne.mi.co.ForgeConfigSpec/CORE]: Incorrect key server.zombieBabyChance was corrected from null to its default, 0.05.
[20:31:53] [Server thread/DEBUG] [ne.mi.co.ForgeConfigSpec/CORE]: The comment on key server.zombieBabyChance does not match the spec. This may create a backup.
[20:31:53] [Server thread/WARN] [ne.mi.co.ForgeConfigSpec/CORE]: Incorrect key server.logCascadingWorldGeneration was corrected from null to its default, true.
[20:31:53] [Server thread/DEBUG] [ne.mi.co.ForgeConfigSpec/CORE]: The comment on key server.logCascadingWorldGeneration does not match the spec. This may create a backup.
[20:31:53] [Server thread/WARN] [ne.mi.co.ForgeConfigSpec/CORE]: Incorrect key server.fixVanillaCascading was corrected from null to its default, false.
[20:31:53] [Server thread/DEBUG] [ne.mi.co.ForgeConfigSpec/CORE]: The comment on key server.fixVanillaCascading does not match the spec. This may create a backup.
[20:31:53] [Server thread/WARN] [ne.mi.co.ForgeConfigSpec/CORE]: Incorrect key server.dimensionUnloadQueueDelay was corrected from null to its default, 0.
[20:31:53] [Server thread/DEBUG] [ne.mi.co.ForgeConfigSpec/CORE]: The comment on key server.dimensionUnloadQueueDelay does not match the spec. This may create a backup.
[20:31:53] [Server thread/WARN] [ne.mi.co.ForgeConfigSpec/CORE]: Incorrect key server.treatEmptyTagsAsAir was corrected from null to its default, false.
[20:31:53] [Server thread/DEBUG] [ne.mi.co.ForgeConfigSpec/CORE]: The comment on key server.treatEmptyTagsAsAir does not match the spec. This may create a backup.
[20:31:53] [Server thread/WARN] [ne.mi.co.ForgeConfigSpec/CORE]: Incorrect key server.fixAdvancementLoading was corrected from null to its default, true.
[20:31:53] [Server thread/DEBUG] [ne.mi.co.ForgeConfigSpec/CORE]: The comment on key server.fixAdvancementLoading does not match the spec. This may create a backup.
[20:31:53] [Server thread/DEBUG] [ne.mi.co.ForgeConfigSpec/CORE]: The comment on key server does not match the spec. This may create a backup.
[20:31:53] [Server thread/DEBUG] [ne.mi.co.ForgeConfig/FORGEMOD]: Loaded forge config file forge-server.toml
[20:31:54] [Server thread/INFO] [minecraft/MinecraftServer]: Preparing start region for dimension minecraft:overworld
The full path for the file is
D:\Minecraft Mod\Bountiful Boons\src\main\resources\data\bountiful_boons\advancements\zeus\zeus.json