Please check the pinned issues "Solutions to Frequent Issues" and "Known Forge Issues" before posting a new report

Loader
Forge/Fabric

Versions

• Minecraft Version
• Mod Loader Version
• Origins++ Version

Notes
Error displays when trying to join server

"Missing required datapack registries : moonlight:map_markers, moonlight:soft_fluids"

That sounds like another mod or datapack is causing the issue as Origins++ doesn't use the moonlight: namespace