Got this error while using sponge 1.12.2-2838-7.2.3.
The same thing happens while using YAML.
All dependencies are downloaded correctly in libs/
Any suggestions would be helpful, thanks.

[06:00:00] [Server thread/INFO] [minecraft/DedicatedServer]: __
[06:00:00] [Server thread/INFO] [minecraft/DedicatedServer]: | |) LuckPerms v5.1.79
[06:00:00] [Server thread/INFO] [minecraft/DedicatedServer]: |_ | Running on Sponge - SpongeForge
[06:00:00] [Server thread/INFO] [minecraft/DedicatedServer]:
[06:00:00] [Server thread/INFO] [luckperms]: Loading configuration...
[06:00:54] [Forge Version Check/INFO] [forge.VersionCheck]: [spongeforge] Starting version check at https://files.minecraftforge.net/maven/org/spongepowered/spongeforge/promotions_slim.json
[06:01:54] [pool-3-thread-11/ERROR] [luckperms]: Unable to load dependency HIKARI.
[06:01:54] [pool-3-thread-12/ERROR] [luckperms]: Unable to load dependency MYSQL_DRIVER.

There should be more information than that - check your full Forge log file.