Oh come on.

Your username: macario77
In which minigame/server does the bug occur: ALL of the server.
Detailed description of bug: Everytime I log in, it shows the lobby briefly and then a light blue screen pops up and I crash. Here is a crash report.

Spoiler

---- Minecraft Crash Report ----
// Hi. I'm Minecraft, and I'm a crashaholic.

Time: 9/7/14 4:54 PM
Description: Rendering entity in world

java.lang.ClassCastException: java.lang.Byte cannot be cast to java.lang.Short
at xv.b(SourceFile:96)
at aer.ck(SourceFile:297)
at cpr.a(SourceFile:28)
at cpr.a(SourceFile:12)
at cpt.a(SourceFile:294)
at cpt.a(SourceFile:259)
at cpt.a(SourceFile:226)
at ckn.a(SourceFile:583)
at cji.a(SourceFile:1225)
at cji.a(SourceFile:1130)
at cji.b(SourceFile:983)
at bsu.as(SourceFile:903)
at bsu.a(SourceFile:314)
at net.minecraft.client.main.Main.main(SourceFile:120)


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

-- Head --
Stacktrace:
at xv.b(SourceFile:96)
at aer.ck(SourceFile:297)
at cpr.a(SourceFile:28)
at cpr.a(SourceFile:12)

-- Entity being rendered --
Details:
Entity Type: Enderman (aer)
Entity ID: -2147483613
Entity Name: Enderman
Entity's Exact location: -33.34, 56.00, 236.34
Entity's Block location: -34.00,56.00,236.00 - World: (-34,56,236), Chunk: (at 14,3,12 in -3,14; contains blocks -48,0,224 to -33,255,239), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
Entity's Momentum: 0.00, 0.00, 0.00
Entity's Rider: ~~ERROR~~ NullPointerException: null
Entity's Vehicle: ~~ERROR~~ NullPointerException: null

-- Renderer details --
Details:
Assigned renderer: cpr@55d48209
Location: 2.66,-3.00,19.34 - World: (2,-4,19), Chunk: (at 2,-1,3 in 0,1; contains blocks 0,0,16 to 15,255,31), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Rotation: -139.21875
Delta: 0.45397186
Stacktrace:
at cpt.a(SourceFile:294)
at cpt.a(SourceFile:259)
at cpt.a(SourceFile:226)
at ckn.a(SourceFile:583)
at cji.a(SourceFile:1225)
at cji.a(SourceFile:1130)

-- Affected level --
Details:
Level name: MpServer
All players: 41 total; [cio['macario77'/728535, l='MpServer', x=-36.00, y=59.00, z=217.00], cip['PredatorToad'/728407, l='MpServer', x=-36.00, y=59.00, z=217.00], cip['rockor1757'/668806, l='MpServer', x=-35.50, y=60.50, z=217.50], cip['kruizsmith'/727552, l='MpServer', x=-35.50, y=59.00, z=217.50], cip['guysmells'/728417, l='MpServer', x=-38.88, y=59.00, z=218.22], cip['nrdbrk'/728429, l='MpServer', x=-43.09, y=59.00, z=217.47], cip['popman108'/728343, l='MpServer', x=-34.63, y=59.00, z=222.34], cip['Kiks26'/728321, l='MpServer', x=-35.97, y=59.00, z=219.44], cip['64brother'/723816, l='MpServer', x=-39.91, y=59.63, z=217.72], cip['Mr_Dragonman'/501823, l='MpServer', x=-45.63, y=62.50, z=213.72], cip['xYuno'/727972, l='MpServer', x=-40.13, y=59.00, z=216.31], cip['MiaBug831'/728496, l='MpServer', x=-35.50, y=59.00, z=217.50], cip['YFIOTR'/719194, l='MpServer', x=-20.06, y=56.00, z=216.13], cip['NESlover1'/728003, l='MpServer', x=-16.66, y=56.00, z=225.06], cip['AlfieeGaming'/585642, l='MpServer', x=-34.91, y=56.50, z=230.44], cip['Fluffakins'/411939, l='MpServer', x=-37.50, y=56.00, z=235.25], cip['Danonkis_ZuZu'/712370, l='MpServer', x=-36.00, y=58.50, z=226.19], cip['hotsauce125'/726708, l='MpServer', x=-32.69, y=63.50, z=227.63], cip['OrieToim'/712759, l='MpServer', x=-39.59, y=59.00, z=224.09], cip['KateVampire'/719177, l='MpServer', x=-46.50, y=56.00, z=236.16], cip['tropic811'/703206, l='MpServer', x=-33.09, y=56.00, z=235.19], cip['MudKipper85'/718289, l='MpServer', x=-46.56, y=57.56, z=230.16], cip['spspenguin01'/724124, l='MpServer', x=-50.03, y=57.09, z=239.59], cip['DragonTaima'/728536, l='MpServer', x=-36.00, y=59.00, z=217.00], cip['xXKittyLuvsyouXx'/717863, l='MpServer', x=-60.13, y=56.00, z=209.47], cip['mindmanipulator'/728294, l='MpServer', x=-53.34, y=56.00, z=217.53], cip['Gaminex769'/712410, l='MpServer', x=-39.63, y=62.50, z=207.75], cip['_Starlight13_'/625238, l='MpServer', x=-39.88, y=56.00, z=196.75], cip['WolfyTheFur'/504978, l='MpServer', x=-43.41, y=56.00, z=194.06], cip['robinson4545'/726369, l='MpServer', x=-4.38, y=56.50, z=222.34], cip['Spykill3r'/629291, l='MpServer', x=-21.47, y=56.00, z=244.38], cip['PandaCaity'/391497, l='MpServer', x=-17.34, y=56.00, z=247.72], cip['cakeman18'/727158, l='MpServer', x=-31.31, y=56.00, z=244.66], cip['BigBoyKitty'/717453, l='MpServer', x=-23.44, y=56.00, z=243.88], cip['njziebold'/728537, l='MpServer', x=-36.00, y=59.00, z=217.00], cip['BobFrankie'/697513, l='MpServer', x=-68.69, y=56.00, z=236.56], cip['CreeperGal03'/724874, l='MpServer', x=-3.53, y=56.00, z=189.38], cip['Devin610'/486997, l='MpServer', x=12.59, y=116.50, z=198.56], cip['HansPeter_Ueli'/728539, l='MpServer', x=-36.00, y=59.00, z=217.00], cip['JSH2004'/728540, l='MpServer', x=-36.00, y=59.00, z=217.00], cip['Derpface14'/716130, l='MpServer', x=-68.69, y=56.00, z=236.56]]
Chunk stats: MultiplayerChunkCache: 121, 121
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: -36.00,59.00,217.00 - World: (-36,59,217), Chunk: (at 12,3,9 in -3,13; contains blocks -48,0,208 to -33,255,223), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
Level time: 130434724 game time, 4532285700 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: adventure (ID 2). Hardcore: false. Cheats: false
Forced entities: ~~ERROR~~ ClassCastException: amj cannot be cast to java.lang.String
Retry entities: 0 total; []
Server brand: BungeeCord (git:BungeeCord-Bootstrap:1.8-SNAPSHOT:"65ae8b4":994) <- Spigot
Server type: Non-integrated multiplayer server
Stacktrace:
at cen.a(SourceFile:308)
at bsu.b(SourceFile:2252)
at bsu.a(SourceFile:323)
at net.minecraft.client.main.Main.main(SourceFile:120)

-- System Details --
Details:
Minecraft Version: 1.8
Operating System: Mac OS X (x86_64) version 10.7.5
Java Version: 1.6.0_45, Apple Inc.
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Apple Inc.
Memory: 81082800 bytes (77 MB) / 215048192 bytes (205 MB) up to 1065025536 bytes (1015 MB)
JVM Flags: 1 total; -Xmx1G
IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
Launched Version: 1.8
LWJGL: 2.9.2
OpenGL: AMD Radeon HD 6750M OpenGL Engine GL version 2.1 ATI-7.32.12, ATI Technologies Inc.
GL Caps: Using GL 1.3 multitexturing.
Using GL 1.3 texture combiners.
Using framebuffer objects because ARB_framebuffer_object is supported and separate blending is supported.
Shaders are available because OpenGL 2.1 is supported.
VBOs are available because OpenGL 1.5 is supported.

Using VBOs: No
Is Modded: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Resource Packs: [xixSuPRem3xix CookieRanga]
Current Language: English (UK)
Profiler Position: N/A (disabled)

 

The exact same thing keeps happening to me. I don't know what's happening.

 

Yep, Ugh, I thought it was just me, I was getting really annoyed...

 

From my experiements with Macario and others, 1.8 has this bug, while 1.7 does not.

Please note that this is an unofficial suggestion.
I recommend you downgrade to 1.7 in the time being.

 

Actually, this is NOT a Minecraft problem.

This is actually a problem with what the server is sending the client, most likely brought upon by the recent 1.8 "upgrade"
I blame DisguiseCraft.

So...
Don't lock it :P

 

Actually from what I remember when the server first upgraded to 1.7, DisguiseCraft was disabled for the exact same reasons. Until a stable version was released, it stayed disabled. That might be what will end up happening here.

 

java.lang.Byte can not be cast to java.lang.Short

Judging from that, as well as the crash logs (the entity type, etcetera), it is most DEFINITELY a problem with DisguiseCraft. Same thing happened, I think, when the server used the unofficial 1.7 protocol build.

 

Could we just extract the DisguiseCraft plugin for a little while, then? Or is it more complicated than that(I'm bad with plugins)?