Pretty much I have been playing on my own 1.7.10 Minecraft Server with my sister and cousin but now whenever my cousin and I join the server closes but my sister can join with no problem?  This started happening out of no where!?!? Here is the crash report...

 

---- Minecraft Crash Report ----

// You're mean.

 

Time: 7/16/16 3:09 PM

Description: Ticking entity

 

java.lang.NullPointerException: Ticking entity

at net.minecraft.entity.ai.EntityLookHelper.func_75651_a(SourceFile:18)

at net.minecraft.entity.ai.EntityAIAttackOnCollide.func_75246_d(EntityAIAttackOnCollide.java:93)

at net.minecraft.entity.ai.EntityAITasks.func_75774_a(SourceFile:103)

at net.minecraft.entity.EntityLiving.func_70619_bc(EntityLiving.java:540)

at net.minecraft.entity.EntityLivingBase.func_70636_d(EntityLivingBase.java:1774)

at net.minecraft.entity.EntityLiving.func_70636_d(EntityLiving.java:367)

at net.minecraft.entity.monster.EntityMob.func_70636_d(SourceFile:25)

at net.minecraft.entity.EntityLivingBase.func_70071_h_(EntityLivingBase.java:1611)

at net.minecraft.entity.EntityLiving.func_70071_h_(EntityLiving.java:206)

at net.minecraft.entity.monster.EntityMob.func_70071_h_(SourceFile:30)

at net.minecraft.world.World.func_72866_a(World.java:2070)

at net.minecraft.world.WorldServer.func_72866_a(WorldServer.java:648)

at net.minecraft.world.World.func_72870_g(World.java:2034)

at net.minecraft.world.World.func_72939_s(World.java:1887)

at net.minecraft.world.WorldServer.func_72939_s(WorldServer.java:489)

at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:636)

at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:334)

at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:547)

at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:427)

at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:685)

 

 

A detailed walkthrough of the error, its code path and all known details is as follows:

---------------------------------------------------------------------------------------

 

-- Head --

Stacktrace:

at net.minecraft.entity.ai.EntityLookHelper.func_75651_a(SourceFile:18)

at net.minecraft.entity.ai.EntityAIAttackOnCollide.func_75246_d(EntityAIAttackOnCollide.java:93)

at net.minecraft.entity.ai.EntityAITasks.func_75774_a(SourceFile:103)

at net.minecraft.entity.EntityLiving.func_70619_bc(EntityLiving.java:540)

at net.minecraft.entity.EntityLivingBase.func_70636_d(EntityLivingBase.java:1774)

at net.minecraft.entity.EntityLiving.func_70636_d(EntityLiving.java:367)

at net.minecraft.entity.monster.EntityMob.func_70636_d(SourceFile:25)

at net.minecraft.entity.EntityLivingBase.func_70071_h_(EntityLivingBase.java:1611)

at net.minecraft.entity.EntityLiving.func_70071_h_(EntityLiving.java:206)

at net.minecraft.entity.monster.EntityMob.func_70071_h_(SourceFile:30)

at net.minecraft.world.World.func_72866_a(World.java:2070)

at net.minecraft.world.WorldServer.func_72866_a(WorldServer.java:648)

at net.minecraft.world.World.func_72870_g(World.java:2034)

 

-- Entity being ticked --

Details:

Entity Type: arsmagica2.MobDarkMage (am2.entities.EntityDarkMage)

Entity ID: 1735

Entity Name: Dark Mage

Entity's Exact location: 180.48, 66.00, 1065.10

Entity's Block location: World: (180,66,1065), Chunk: (at 4,4,9 in 11,66; contains blocks 176,0,1056 to 191,255,1071), Region: (0,2; contains chunks 0,64 to 31,95, blocks 0,0,1024 to 511,255,1535)

Entity's Momentum: 0.00, -0.08, 0.00

Stacktrace:

at net.minecraft.world.World.func_72939_s(World.java:1887)

at net.minecraft.world.WorldServer.func_72939_s(WorldServer.java:489)

 

-- Affected level --

Details:

Level name: world

All players: 1 total; [EntityPlayerMP['SoraSky119'/1730, l='world', x=213.52, y=67.50, z=1090.13]]

Chunk stats: ServerChunkCache: 716 Drop: 0

Level seed: -8146310344407841894

Level generator: ID 00 - default, ver 1. Features enabled: true

Level generator options:

Level spawn location: World: (690,64,661), Chunk: (at 2,4,5 in 43,41; contains blocks 688,0,656 to 703,255,671), Region: (1,1; contains chunks 32,32 to 63,63, blocks 512,0,512 to 1023,255,1023)

Level time: 2495207 game time, 44277 day time

Level dimension: 0

Level storage version: 0x04ABD - Anvil

Level weather: Rain time: 154811 (now: false), thunder time: 94812 (now: false)

Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false

Stacktrace:

at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:636)

at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:334)

at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:547)

at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:427)

at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:685)

 

-- System Details --

Details:

Minecraft Version: 1.7.10

Operating System: Windows 10 (amd64) version 10.0

Java Version: 1.8.0_92, Oracle Corporation

Java VM Version: Java HotSpot 64-Bit Server VM (mixed mode), Oracle Corporation

Memory: 5241942328 bytes (4999 MB) / 5503451136 bytes (5248 MB) up to 5726797824 bytes (5461 MB)

JVM Flags: 2 total; -Xmx6G -Xms5G

AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used

IntCache: cache: 1, tcache: 1, allocated: 12, tallocated: 94

FML: MCP v9.05 FML v7.10.99.99 Minecraft Forge 10.13.3.1408 25 mods loaded, 25 mods active

mcp{9.05} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available

FML{7.10.99.99} [Forge Mod Loader] (forge-1.7.10-10.13.3.1408-1.7.10-universal.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available

Forge{10.13.3.1408} [Minecraft Forge] (forge-1.7.10-10.13.3.1408-1.7.10-universal.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available

AM2-Preloader{0.0.3} [AMCore] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available

AnimationAPI{1.2.4} [AnimationAPI] (AnimationAPI-1.7.10-1.2.4.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available

arsmagica2{1.4.0.009} [Ars Magica 2] (1.7.10_AM2-1.4.0.009.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available

ClothingCraft{1.2.1} [ClothingCraft] ([1.7.10] ClothingCraft 1.2.1.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available

ArchimedesShips{1.7.10 v1.7.1} [Archimedes' Ships] (ArchimedesShips-1.7.1.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available

Backpack{2.0.1} [backpack] (backpack-2.0.1-1.7.x.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available

BiblioCraft{1.11.5} [biblioCraft] (BiblioCraft[v1.11.5][MC1.7.10].jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available

CarpentersBlocks{3.3.8.1_dev_r1} [Carpenter's Blocks] (Carpenter's Blocks v3.3.8.1_dev_r1 - MC 1.7.10.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available

cfm{3.4.8} [§9MrCrayfish's Furniture Mod] (cfm-3.4.8-mc1.7.10.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available

craftguide{1.6.8.2} [CraftGuide] (CraftGuide-1.6.8.2-forge.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available

CustomSpawner{3.3.0} [DrZhark's CustomSpawner] (CustomMobSpawner 3.3.0.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available

customnpcs{1.7.10d} [CustomNpcs] (CustomNPCs_1.7.10d(21feb16).jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available

MoCreatures{6.3.1} [DrZhark's Mo'Creatures Mod] (DrZharks MoCreatures Mod v6.3.1.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available

flansmod{4.10.0} [Flan's Mod] (Flans Mod-1.7.10-4.10.0.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available

FoodPlus{3.2rS} [§bFood Plus] (FoodPlus-1.7.2-3.2rS.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available

reaper_lantern{1.47} [Lantern mod] (Lantern1.47[1.7.10].jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available

RadixCore{2.1.1} [RadixCore] (RadixCore-1.7.10-2.1.1-universal.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available

MCA{1.7.10-5.1.2} [Minecraft Comes Alive] (MCA-1.7.10-5.1.2-universal.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available

mfs{4.1.0} [Minecraft Flight Simulator] (Minecraft Flight Simulator-1.7.10-4.1.0.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available

RopesPlus{1.6.4} [Ropes+] (RopePlus-1.7.10.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available

vending{1.2.3} [vending] (vending-v1.2.3.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available

weaponmod{v1.14.3} [balkon's WeaponMod] (weaponmod-1.14.3.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available

Profiler Position: N/A (disabled)

Vec3 Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used

Player Count: 1 / 20; [EntityPlayerMP['SoraSky119'/1730, l='world', x=213.52, y=67.50, z=1090.13]]

Is Modded: Definitely; Server brand changed to 'fml,forge'

Type: Dedicated Server (map_server.txt)

A mob from ArsMagica is broken.

Update to 1.10.2.

 

I don't get it, why would it affect some players but not all? And why didn't this problem happen earlier for the first several hours on the server ? 

This is not affecting certain players, this is the server crashing. I assume it happens when certain players join since they are the ones loading the chunks where that entity is.

 

Do you know any way to fix this? I really don't want to loose this server, my friends and I built a lot on it and now it's all lost  :'(

You can try and use MCEdit to remove the entity, you can try to speak to the mod-devs to release a fix version.

 

Ok, thanks so much for your help!