Minecraft Forums

I have been playing with Single player commands (just to use worldedit), with my freind on a LAN world. We both use forge with magic launcher to be able to play on it. However one day this error message came up and has come up since whenever he joins the world (I am able to set up the LAN world fine. He seems to be crashing it.)

Minecraft has crashed!
----------------------
Minecraft has stopped running because it encountered a problem; Ticking entity
A full error report has been saved to C:\Users\Me\AppData\Roaming\.minecraft\crash-reports\crash-2013-02-17_21.24.34-client.txt - Please include a copy of that file (Not this screen!) if you report this crash to anyone; without it, they will not be able to help fix the crash

--- BEGIN ERROR REPORT defa7f07 --------
Full report at:
C:\Users\(Me)\AppData\Roaming\.minecraft\crash-reports\crash-2013-02-17_21.24.34-client.txt
Please show that file to Mojang, NOT just this screen!
Generated 2/17/13 9:24 PM
-- Head --
Stacktrace:
at lm.a(PotionEffect.java:180)
at md.bx(EntityLiving.java:2386)
at md.y(EntityLiving.java:668)
at lq.j_(Entity.java:431)
at md.j_(EntityLiving.java:808)
at qx.j_(EntityPlayer.java:328)
at bah.j_(SourceFile:65)
at yc.a(World.java:2291)
at yc.g(World.java:2253)
-- Entity being ticked --
Details:
Entity Type: null (bah)
Entity ID: 20652
Name: (My Friend)
Exact location: -578.69, 70.00, -571.63
Block location: World: (-579,70,-572), Chunk: (at 13,4,4 in -37,-36; contains blocks -592,0,-576 to -577,255,-561), Region: (-2,-2; contains chunks -64,-64 to -33,-33, blocks -1024,0,-1024 to -513,255,-513)
Momentum: 0.00, 0.00, 0.00
Stacktrace:
at yc.h(World.java:2107)
-- Affected level --
Details:
Level name: MpServer
All players: 2 total; [ays['My Mc username'/1724, l='MpServer', x=-577.78, y=65.62, z=-584.63], bah['(My freind)'/20652, l='MpServer', x=-578.69, y=70.00, z=-571.63]]
Chunk stats: MultiplayerChunkCache: 441
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (-252,64,248), Chunk: (at 4,4,8 in -16,15; contains blocks -256,0,240 to -241,255,255), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
Level time: 9239915 game time, 19478 day time
Level dimension: 0
Level storage version: 0x00000 - Unknown?
Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: false
Forced entities: 79 total; [qr['Zombie'/20654, l='MpServer', x=-596.50, y=64.00, z=-657.50], bah['(MY freind)'/20652, l='MpServer', x=-578.69, y=70.00, z=-571.63], oy['Chicken'/1915, l='MpServer', x=-511.41, y=62.32, z=-546.41], px['item.item.dyePowder.black'/15307, l='MpServer', x=-546.31, y=56.13, z=-562.81], oy['Chicken'/1914, l='MpServer', x=-509.59, y=61.51, z=-551.53], px['item.item.dyePowder.black'/15309, l='MpServer', x=-548.56, y=56.13, z=-561.03], oy['Chicken'/1916, l='MpServer', x=-502.44, y=67.00, z=-516.56], ow['Bat'/16792, l='MpServer', x=-598.53, y=49.00, z=-564.25], qc['Creeper'/19245, l='MpServer', x=-625.50, y=32.00, z=-575.50], oy['Chicken'/1908, l='MpServer', x=-516.56, y=62.54, z=-531.44], ow['Bat'/19781, l='MpServer', x=-502.53, y=46.26, z=-543.31], qr['Zombie'/20661, l='MpServer', x=-583.50, y=40.00, z=-626.50], ow['Bat'/20300, l='MpServer', x=-504.29, y=46.40, z=-540.70], ow['Bat'/20301, l='MpServer', x=-505.25, y=46.00, z=-545.75], ow['Bat'/16555, l='MpServer', x=-625.39, y=15.00, z=-569.33], qr['Zombie'/20614, l='MpServer', x=-615.39, y=63.00, z=-613.62], qc['Creeper'/20609, l='MpServer', x=-614.50, y=63.00, z=-612.50], qr['Zombie'/19573, l='MpServer', x=-524.50, y=38.00, z=-562.50], qp['Spider'/18132, l='MpServer', x=-592.81, y=52.00, z=-608.03], ow['Bat'/1864, l='MpServer', x=-582.75, y=56.10, z=-584.25], ow['Bat'/20309, l='MpServer', x=-551.66, y=56.10, z=-505.25], px['item.item.egg'/15004, l='MpServer', x=-516.88, y=60.13, z=-532.22], qc['Creeper'/14172, l='MpServer', x=-551.00, y=45.00, z=-585.50], ow['Bat'/1851, l='MpServer', x=-583.75, y=60.10, z=-575.44], ow['Bat'/20019, l='MpServer', x=-616.38, y=49.00, z=-576.47], qn['Skeleton'/20259, l='MpServer', x=-557.50, y=68.00, z=-521.50], ow['Bat'/1833, l='MpServer', x=-595.84, y=51.10, z=-566.06], bah['(My freind'/20652, l='MpServer', x=-578.69, y=70.00, z=-571.63], qc['Creeper'/19752, l='MpServer', x=-571.50, y=20.00, z=-535.50], qc['Creeper'/18055, l='MpServer', x=-570.50, y=64.00, z=-652.50], oy['Chicken'/1817, l='MpServer', x=-634.41, y=63.00, z=-523.38], ow['Bat'/20237, l='MpServer', x=-590.23, y=28.44, z=-597.07], pe['Sheep'/1816, l='MpServer', x=-633.75, y=63.00, z=-519.56], pe['Sheep'/1815, l='MpServer', x=-624.38, y=63.00, z=-541.16], qn['Skeleton'/20673, l='MpServer', x=-652.50, y=65.00, z=-520.50], qn['Skeleton'/19984, l='MpServer', x=-551.50, y=50.00, z=-517.50], qr['Zombie'/19749, l='MpServer', x=-570.50, y=20.00, z=-534.50], qn['Skeleton'/20674, l='MpServer', x=-652.50, y=65.00, z=-519.50], qn['Skeleton'/20224, l='MpServer', x=-555.50, y=46.00, z=-505.50], qr['Zombie'/18794, l='MpServer', x=-562.50, y=64.00, z=-638.50], oz['Cow'/1811, l='MpServer', x=-629.03, y=60.00, z=-600.88], qp['Spider'/18799, l='MpServer', x=-565.78, y=64.00, z=-636.00], pe['Sheep'/1808, l='MpServer', x=-635.19, y=62.00, z=-634.50], qr['Zombie'/20251, l='MpServer', x=-645.50, y=25.00, z=-582.50], qr['Zombie'/20250, l='MpServer', x=-647.50, y=25.00, z=-583.50], qr['Zombie'/20252, l='MpServer', x=-602.50, y=49.00, z=-567.50], pe['Sheep'/1798, l='MpServer', x=-649.53, y=63.00, z=-625.63], ow['Bat'/19764, l='MpServer', x=-533.75, y=39.10, z=-523.59], oz['Cow'/1799, l='MpServer', x=-646.25, y=62.00, z=-622.59], oz['Cow'/1796, l='MpServer', x=-652.41, y=61.00, z=-646.34], pe['Sheep'/1797, l='MpServer', x=-652.06, y=60.00, z=-648.13], pe['Sheep'/1793, l='MpServer', x=-653.03, y=63.00, z=-522.97], qr['Zombie'/19905, l='MpServer', x=-635.54, y=16.00, z=-539.72], qc['Creeper'/20221, l='MpServer', x=-504.53, y=60.00, z=-525.22], qr['Zombie'/15653, l='MpServer', x=-595.50, y=64.00, z=-633.50], qr['Zombie'/19648, l='MpServer', x=-598.14, y=64.00, z=-636.86], qp['Spider'/19651, l='MpServer', x=-600.22, y=64.00, z=-635.19], qr['Zombie'/19650, l='MpServer', x=-597.50, y=64.00, z=-640.50], qp['Spider'/19653, l='MpServer', x=-598.50, y=64.00, z=-633.63], oz['Cow'/1783, l='MpServer', x=-656.16, y=63.00, z=-652.13], oz['Cow'/1781, l='MpServer', x=-657.66, y=63.00, z=-660.25], oy['Chicken'/1785, l='MpServer', x=-658.44, y=63.00, z=-612.56], ays['My MC username'/1724, l='MpServer', x=-577.78, y=65.62, z=-584.63], qr['Zombie'/20447, l='MpServer', x=-617.50, y=13.00, z=-528.50], qn['Skeleton'/19427, l='MpServer', x=-591.50, y=64.00, z=-648.50], qp['Spider'/20129, l='MpServer', x=-623.28, y=21.00, z=-536.47], ph['Squid'/17439, l='MpServer', x=-530.50, y=53.67, z=-593.03], qd['Enderman'/13193, l='MpServer', x=-572.50, y=33.00, z=-602.34], qr['Zombie'/18628, l='MpServer', x=-559.25, y=19.00, z=-615.25], qc['Creeper'/19646, l='MpServer', x=-553.37, y=20.00, z=-541.67], qc['Creeper'/19647, l='MpServer', x=-552.50, y=20.00, z=-542.50], qc['Creeper'/19645, l='MpServer', x=-546.94, y=13.00, z=-542.75], qr['Zombie'/20125, l='MpServer', x=-607.50, y=36.00, z=-586.50], qd['Enderman'/20126, l='MpServer', x=-618.94, y=21.00, z=-534.28], qd['Enderman'/20127, l='MpServer', x=-622.63, y=21.00, z=-537.91], qr['Zombie'/18942, l='MpServer', x=-625.50, y=32.00, z=-602.50], ph['Squid'/20102, l='MpServer', x=-517.59, y=53.38, z=-639.44], qn['Skeleton'/20383, l='MpServer', x=-543.50, y=40.00, z=-638.50], qr['Zombie'/20380, l='MpServer', x=-586.51, y=22.00, z=-507.06]]
Retry entities: 0 total; []
Stacktrace:
at ayp.a(WorldClient.java:440)
at net.minecraft.client.Minecraft.b(Minecraft.java:2401)
at net.minecraft.client.Minecraft.run(Minecraft.java:787)
at java.lang.Thread.run(Unknown Source)
-- System Details --
Details:
Minecraft Version: 1.4.7
Operating System: Windows 7 (x86) version 6.1
Java Version: 1.6.0_33, Sun Microsystems Inc.
Java VM Version: Java HotSpot™ Client VM (mixed mode, sharing), Sun Microsystems Inc.
Memory: 175832600 bytes (167 MB) / 518979584 bytes (494 MB) up to 518979584 bytes (494 MB)
JVM Flags: 2 total; -Xms512m -Xmx512m
AABB Pool Size: 5228 (292768 bytes; 0 MB) allocated, 1973 (110488 bytes; 0 MB) used
Suspicious classes: FML and Forge are installed
IntCache: cache: 0, tcache: 0, allocated: 1, tallocated: 63
FML: MCP v7.26 FML v4.7.4.520 Minecraft Forge 6.6.0.497 3 mods loaded, 3 mods active
mcp [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available
FML [Forge Mod Loader] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available
Forge [Minecraft Forge] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available
LWJGL: 2.4.2
OpenGL: GeForce 7100 / nForce 630i/PCI/SSE2 GL version 2.1.2, NVIDIA Corporation
Is Modded: Definitely; Client brand changed to 'forge,fml'
Type: Client (map_client.txt)
Texture Pack: Default
Profiler Position: N/A (disabled)
Vec3 Pool Size: 1475 (82600 bytes; 0 MB) allocated, 585 (32760 bytes; 0 MB) used
java.lang.NullPointerException
at lm.a(PotionEffect.java:180)
at md.bx(EntityLiving.java:2386)
at md.y(EntityLiving.java:668)
at lq.j_(Entity.java:431)
at md.j_(EntityLiving.java:808)
at qx.j_(EntityPlayer.java:328)
at bah.j_(SourceFile:65)
at yc.a(World.java:2291)
at yc.g(World.java:2253)
at yc.h(World.java:2107)
at net.minecraft.client.Minecraft.l(Minecraft.java:1863)
at net.minecraft.client.Minecraft.J(Minecraft.java:846)
at net.minecraft.client.Minecraft.run(Minecraft.java:771)
at java.lang.Thread.run(Unknown Source)
--- END ERROR REPORT 1f296e16 ----------
I have never had this happen before.

Notes:He has been ableto join other worlds I set to LAN exept for this one

I uninstalled all mods and he tried to connect from vinilla minecraft(same thing happend)

I force updated both my own and his account (made no difference)
All I know for sure is that the "ticking entity" is my friend.

Quote from TheITGS

It could be a corrupted world. Try using/generating another world, see if that works.

It works with other worlds, but I want that world to work. Would copying it under anOther name work?

Issue resolved All I did was delete his player name under the world file and let him rejoin fresh!