Need help setting up fabric aternos server

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    mod list:

    DEPENDS
    Fabric API
    Cloth API
    Cardinal Components
    BCLib
    Botarium
    Resourceful Config
    Resourceful Lib
    Pehkui
    Player Ability Lib


    MODS
    Ad Astra
    Better Combat
    BetterEnd
    BetterNether
    Comforts
    Just Enough Items
    Macaw's Bridges
    Origins
    Extra Origins
    Simple Voice Chat


    The error log in question:

    [04:08:09] [main/WARN]: Missing data pack

    [04:08:11] [main/WARN]: [bclib] No Center Island Biomes found. Forcing use of vanilla center. x 3

    [04:08:13] [main/WARN]: [bclib] No valid Biome Registry available!

    [04:08:13] [main/WARN]: Failed to load datapacks, can't proceed with server load. You can either fix your datapacks or reset to vanilla with --safeMode


    java.util.concurrent.ExecutionException: java.lang.NullPointerException: Cannot invoke "net.minecraft.class_5455.method_30530(net.minecraft.class_5321)" because "access" is null
    at java.util.concurrent.CompletableFuture.reportGet(Unknown Source) ~[?:?]
    at java.util.concurrent.CompletableFuture.get(Unknown Source) ~[?:?]
    at net.minecraft.server.Main.main(Main.java:199) ~[server-intermediary.jar:?]
    at net.fabricmc.loader.impl.game.minecraft.MinecraftGameProvider.launch(MinecraftGameProvider.java:462) ~[fabric-loader-0.14.17.jar:?]
    at net.fabricmc.loader.impl.launch.knot.Knot.launch(Knot.java:74) ~[fabric-loader-0.14.17.jar:?]
    at net.fabricmc.loader.impl.launch.knot.KnotServer.main(KnotServer.java:23) ~[fabric-loader-0.14.17.jar:?]
    at net.fabricmc.loader.impl.launch.server.FabricServerLauncher.main(FabricServerLauncher.java:69) ~[fabric-loader-0.14.17.jar:?]
    Caused by: java.lang.NullPointerException: Cannot invoke "net.minecraft.class_5455.method_30530(net.minecraft.class_5321)" because "access" is null
    at org.betterx.worlds.together.worldPreset.WorldPresets.get(WorldPresets.java:35) ~[bclib-2.2.4.jar:?]
    at org.betterx.worlds.together.world.event.WorldBootstrap$Helpers.defaultServerPreset(WorldBootstrap.java:76) ~[bclib-2.2.4.jar:?]
    at org.betterx.worlds.together.world.event.WorldBootstrap$Helpers.defaultServerDimensions(WorldBootstrap.java:83) ~[bclib-2.2.4.jar:?]
    at org.betterx.worlds.together.world.event.WorldBootstrap$DedicatedServer.setupWorld(WorldBootstrap.java:122) ~[bclib-2.2.4.jar:?]
    at net.minecraft.server.Main.modify$zdm000$bclib$bcl_onCreate(Main.java:533) ~[server-intermediary.jar:?]
    at net.minecraft.server.Main.method_43613(Main.java:157) ~[server-intermediary.jar:?]
    at net.minecraft.class_7237.method_42098(class_7237.java:42) ~[server-intermediary.jar:?]
    at net.minecraft.server.Main.method_43612(Main.java:152) ~[server-intermediary.jar:?]
    at net.minecraft.class_156.method_43498(class_156.java:942) ~[server-intermediary.jar:?]
    at net.minecraft.class_156.method_43499(class_156.java:936) ~[server-intermediary.jar:?]
    at net.minecraft.server.Main.main(Main.java:150) ~[server-intermediary.jar:?]

    Better end and/or better nether are causing the crash. 1.19.3 version of these mods don't seem to be stable and the mod author recommends staying on 1.19.2 till 1.19.3 gets stable. In your case you should just remove better end and better nether for now.