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Your server is running several plugins that are not compatible with your current Paper/Minecraft version (1.21.5), or are missing required dependencies. Because of this, some plugins fail to start correctly and then throw a lot of “NullPointerException” errors (which basically means “this thing the plugin expected to exist is actually empty / not loaded”).

• Multiverse suite (Core, Inventories, Portals, NetherPortals)
  • Multiverse-Core fails with “VerifyError” and config loading errors. That means the version you’re using is not built for your server version, or its files are broken.
  • Because Multiverse-Core never initializes, the other Multiverse plugins (Inventories, Portals, NetherPortals) also fail and throw errors like:
    • “MultiverseCore has not been initialized!”
    • “Cannot invoke ... InventoriesDupingPatch.disable() because this.dupingPatch is null”
• PhoenixDuels
  • PhoenixDuels crashes on startup with “ExceptionInInitializerError”.
  • After that, its internal helpers are never set up, so you see:
    • “ServerVersion.CURRENT_VERSION is null”
    • “Utilities.ASYNC_SERVICE is null”
    These are just the plugin trying to use things that never got initialized because it failed to start.
• Database / stats plugin (ResultSet is null)
  • Repeated errors like “Cannot invoke ResultSet.next() because resultSet is null” mean a plugin that talks to a database (MySQL/SQLite) is failing to get data.
  • Most likely:
    • Database connection is not set up correctly (wrong host, user, password, or database name), or
    • The plugin is not handling failed queries properly.
• Other plugin issues
  • BanAnnouncer cannot load because it is missing the required plugin “Spicord”.
  • Essentials says you are on an unsupported server version, so that version of Essentials is not meant for 1.21.5.
  • ItemsAdder is missing a bunch of images for “betterranks” (admin.png, mod.png, etc.), so those custom rank icons won’t show up.
  • Some plugins log “VerifyError: Bad type on operand stack” – this is another strong sign they are compiled for a different Minecraft/Java version than what you are running.