Minecraft 1.19.3: Better

Instead of Paper, you should use the official server files provided by the modpack creators.

Standard modpacks like Better Minecraft require or Fabric to run mods, while Paper is designed only for Plugins (Bukkit/Spigot API). Combining them usually causes crashes or broken mod features. How to set up a Better Minecraft 1.19.3 Server Better Minecraft 1.19.3

If you are looking for (a high-performance server software) for the Better Minecraft 1.19.3 modpack, it is important to know that Paper is generally not compatible with modpacks. Instead of Paper, you should use the official