I need help please I need to open this minecraft server

 

---- Minecraft Crash Report ----
// My bad.

Time: 9/2/22, 9:16 AM
Description: Exception in server tick loop

java.lang.NullPointerException: Cannot invoke "net.minecraft.world.SimpleContainer.m_7983_()" because "this.catfishInventory" is null
    at com.github.alexthe666.alexsmobs.entity.EntityCatfish.m_8023_(EntityCatfish.java:145) ~[alexsmobs-1.18.6.jar%2356!/:1.18.6] {re:classloading}
    at com.github.alexthe666.alexsmobs.entity.EntityCatfish.m_6785_(EntityCatfish.java:108) ~[alexsmobs-1.18.6.jar%2356!/:1.18.6] {re:classloading}
    at net.minecraft.world.entity.Mob.<init>(Mob.java:136) ~[server-1.18.2-20220404.173914-srg.jar%23116!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:botania_xplat.mixins.json:AccessorMob,pl:mixin:A}
    at net.minecraft.world.entity.PathfinderMob.<init>(PathfinderMob.java:15) ~[server-1.18.2-20220404.173914-srg.jar%23116!/:?] {re:classloading,re:mixin}
    at net.minecraft.world.entity.animal.WaterAnimal.<init>(WaterAnimal.java:22) ~[server-1.18.2-20220404.173914-srg.jar%23116!/:?] {re:classloading}
    at com.github.alexthe666.alexsmobs.entity.EntityCatfish.<init>(EntityCatfish.java:79) ~[alexsmobs-1.18.6.jar%2356!/:1.18.6] {re:classloading}
    at net.minecraft.world.entity.EntityType.m_20615_(EntityType.java:460) ~[server-1.18.2-20220404.173914-srg.jar%23116!/:?] {re:mixin,re:classloading}
    at flash.npcmod.core.EntityUtil.lambda$loadAllEntitiesIntoEnum$0(EntityUtil.java:12) ~[flashnpcs-1.18.1-1.1.4v2.jar%2386!/:1.1.4v2] {re:classloading}
    at java.lang.Iterable.forEach(Iterable.java:75) ~[?:?] {re:mixin}
    at flash.npcmod.core.EntityUtil.loadAllEntitiesIntoEnum(EntityUtil.java:11) ~[flashnpcs-1.18.1-1.1.4v2.jar%2386!/:1.1.4v2] {re:classloading}
    at flash.npcmod.events.Events.onWorldLoad(Events.java:31) ~[flashnpcs-1.18.1-1.1.4v2.jar%2386!/:1.1.4v2] {re:classloading}
    at net.minecraftforge.eventbus.ASMEventHandler_38_Events_onWorldLoad_Load.invoke(.dynamic) ~[?:?] {}
    at net.minecraftforge.eventbus.ASMEventHandler.invoke(ASMEventHandler.java:85) ~[eventbus-5.0.3.jar%232!/:?] {}
    at net.minecraftforge.eventbus.EventBus.post(EventBus.java:302) ~[eventbus-5.0.3.jar%232!/:?] {}
    at net.minecraftforge.eventbus.EventBus.post(EventBus.java:283) ~[eventbus-5.0.3.jar%232!/:?] {}
    at net.minecraft.server.MinecraftServer.m_129815_(MinecraftServer.java:413) ~[server-1.18.2-20220404.173914-srg.jar%23116!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:balm.mixins.json:MinecraftServerMixin,pl:mixin:APP:terrablender.mixins.json:MixinMinecraftServer,pl:mixin:APP:byg.mixins.json:access.MinecraftServerAccess,pl:mixin:APP:byg.mixins.json:server.MixinMinecraftServer,pl:mixin:A}
    at net.minecraft.server.MinecraftServer.m_130006_(MinecraftServer.java:367) ~[server-1.18.2-20220404.173914-srg.jar%23116!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:balm.mixins.json:MinecraftServerMixin,pl:mixin:APP:terrablender.mixins.json:MixinMinecraftServer,pl:mixin:APP:byg.mixins.json:access.MinecraftServerAccess,pl:mixin:APP:byg.mixins.json:server.MixinMinecraftServer,pl:mixin:A}
    at net.minecraft.server.dedicated.DedicatedServer.m_7038_(DedicatedServer.java:220) ~[server-1.18.2-20220404.173914-srg.jar%23116!/:?] {re:classloading,pl:accesstransformer:B}
    at net.minecraft.server.MinecraftServer.m_130011_(MinecraftServer.java:736) ~[server-1.18.2-20220404.173914-srg.jar%23116!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:balm.mixins.json:MinecraftServerMixin,pl:mixin:APP:terrablender.mixins.json:MixinMinecraftServer,pl:mixin:APP:byg.mixins.json:access.MinecraftServerAccess,pl:mixin:APP:byg.mixins.json:server.MixinMinecraftServer,pl:mixin:A}
    at net.minecraft.server.MinecraftServer.m_177918_(MinecraftServer.java:286) ~[server-1.18.2-20220404.173914-srg.jar%23116!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:balm.mixins.json:MinecraftServerMixin,pl:mixin:APP:terrablender.mixins.json:MixinMinecraftServer,pl:mixin:APP:byg.mixins.json:access.MinecraftServerAccess,pl:mixin:APP:byg.mixins.json:server.MixinMinecraftServer,pl:mixin:A}
    at java.lang.Thread.run(Thread.java:833) [?:?] {re:mixin}

Problem with Alex's Mobs. Make sure you are using the latest version.
If the Mod is already up to date, talk to the Mod author.

A mi me pasa lo mismo