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so yesterday i tryed to play minecraft desteria i went inot a realm and then it crashed i've tryed everything pls help

Crash Report:

-- System Details --
Details:
Minecraft Version: 1.9.2
Operating System: Windows 8.1 (amd64) version 6.3
Java Version: 1.8.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 603571424 bytes (575 MB) / 692584448 bytes (660 MB) up to 10498867200 bytes (10012 MB)
JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx11G
IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
Launched Version: 1.9.2
LWJGL: 2.9.4
OpenGL: GeForce GTX 770M/PCIe/SSE2 GL version 4.5.0 NVIDIA 364.72, NVIDIA Corporation
GL Caps: Using GL 1.3 multitexturing.
Using GL 1.3 texture combiners.
Using framebuffer objects because OpenGL 3.0 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:
Current Language: English (US)
Profiler Position: N/A (disabled)
CPU: 8x Intel(R) Core(TM) i7-4700MQ CPU @ 2.40GHz

11G ? seriously.

--- Minecraft Crash Report ----
// Surprise! Haha. Well, this is awkward.

Time: 1/05/16 2:30 PM
Description: Ticking entity

java.lang.ClassCastException: java.lang.Byte cannot be cast to java.lang.Boolean
at za.m_(SourceFile:164)
at za.bn(SourceFile:426)
at rr.av(SourceFile:1470)
at sa.U(SourceFile:222)
at sb.U(SourceFile:209)
at rr.m(SourceFile:339)
at sa.m(SourceFile:1558)
at sb.m(SourceFile:276)
at yq.m(SourceFile:46)
at za.m(SourceFile:299)
at aht.a(SourceFile:1516)
at aht.g(SourceFile:1494)
at aht.k(SourceFile:1384)
at bcc.t(SourceFile:1641)
at bcc.av(SourceFile:962)
at bcc.a(SourceFile:392)
at net.minecraft.client.main.Main.main(SourceFile:124)

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

-- Head --
Stacktrace:
at za.m_(SourceFile:164)
at za.bn(SourceFile:426)
at rr.av(SourceFile:1470)
at sa.U(SourceFile:222)
at sb.U(SourceFile:209)
at rr.m(SourceFile:339)
at sa.m(SourceFile:1558)
at sb.m(SourceFile:276)
at yq.m(SourceFile:46)
at za.m(SourceFile:299)
at aht.a(SourceFile:1516)
at aht.g(SourceFile:1494)

-- Entity being ticked --
Details:
Entity Type: Zombie (za)
Entity ID: 14894880
Entity Name: Zombie
Entity's Exact location: -9256.44, 65.22, -9298.69
Entity's Block location: World: (-9257,65,-9299), Chunk: (at 7,4,13 in -579,-582; contains blocks -9264,0,-9312 to -9249,255,-9297), Region: (-19,-19; contains chunks -608,-608 to -577,-577, blocks -9728,0,-9728 to -9217,255,-9217)
Entity's Momentum: 0.00, -0.08, 0.00
Entity's Passengers: []
Entity's Vehicle: ~~ERROR~~ NullPointerException: null
Stacktrace:
at aht.k(SourceFile:1384)

-- Affected level --
Details:
Level name: MpServer
All players: 1 total; [bmq['ScOpEz_Frosty'/13981, l='MpServer', x=-9253.65, y=75.00, z=-9307.38]]
Chunk stats: MultiplayerChunkCache: 8, 8
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (4192,64,3349), Chunk: (at 0,4,5 in 262,209; contains blocks 4192,0,3344 to 4207,255,3359), Region: (8,6; contains chunks 256,192 to 287,223, blocks 4096,0,3072 to 4607,255,3583)
Level time: 676004381 game time, 608089702 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: survival (ID 0). Hardcore: false. Cheats: false
Forced entities: 17 total; [vx['Chicken'/14894883, l='MpServer', x=-9267.16, y=78.00, z=-9302.53], vx['Chicken'/14894882, l='MpServer', x=-9271.66, y=79.00, z=-9310.44], vx['Chicken'/14894881, l='MpServer', x=-9256.44, y=64.88, z=-9298.59], za['Zombie'/14894880, l='MpServer', x=-9256.44, y=65.22, z=-9298.69], vx['Chicken'/14894886, l='MpServer', x=-9253.44, y=75.00, z=-9284.66], vx['Chicken'/14894885, l='MpServer', x=-9257.44, y=73.00, z=-9294.44], vx['Chicken'/14894884, l='MpServer', x=-9265.47, y=77.00, z=-9311.03], vx['Chicken'/14894890, l='MpServer', x=-9271.53, y=75.00, z=-9294.78], za['Zombie'/14894889, l='MpServer', x=-9253.50, y=64.00, z=-9294.50], vx['Chicken'/14894888, l='MpServer', x=-9262.59, y=73.00, z=-9289.97], bmq['ScOpEz_Frosty'/13981, l='MpServer', x=-9253.65, y=75.00, z=-9307.38], vx['Chicken'/14894875, l='MpServer', x=-9261.75, y=72.00, z=-9296.19], vx['Chicken'/14894874, l='MpServer', x=-9263.59, y=77.00, z=-9307.44], za['Zombie'/14894879, l='MpServer', x=-9255.66, y=64.00, z=-9297.16], za['Zombie'/14894878, l='MpServer', x=-9254.25, y=64.00, z=-9297.34], za['Zombie'/14894877, l='MpServer', x=-9259.25, y=64.00, z=-9296.97], za['Zombie'/14894876, l='MpServer', x=-9254.06, y=64.00, z=-9298.22]]
Retry entities: 12 total; [vx['Chicken'/14894886, l='MpServer', x=-9253.44, y=75.00, z=-9284.66], vx['Chicken'/14894885, l='MpServer', x=-9257.44, y=73.00, z=-9294.44], vx['Chicken'/14894884, l='MpServer', x=-9265.47, y=77.00, z=-9311.03], vx['Chicken'/14894890, l='MpServer', x=-9271.53, y=75.00, z=-9294.78], za['Zombie'/14894889, l='MpServer', x=-9253.50, y=64.00, z=-9294.50], vx['Chicken'/14894888, l='MpServer', x=-9262.59, y=73.00, z=-9289.97], vx['Chicken'/14894875, l='MpServer', x=-9261.75, y=72.00, z=-9296.19], vx['Chicken'/14894874, l='MpServer', x=-9263.59, y=77.00, z=-9307.44], za['Zombie'/14894879, l='MpServer', x=-9255.66, y=64.00, z=-9297.16], za['Zombie'/14894878, l='MpServer', x=-9254.25, y=64.00, z=-9297.34], za['Zombie'/14894877, l='MpServer', x=-9259.25, y=64.00, z=-9296.97], za['Zombie'/14894876, l='MpServer', x=-9254.06, y=64.00, z=-9298.22]]
Server brand: PaperSpigot
Server type: Non-integrated multiplayer server
Stacktrace:
at bkr.a(SourceFile:365)
at bcc.b(SourceFile:2515)
at bcc.a(SourceFile:401)
at net.minecraft.client.main.Main.main(SourceFile:124)

-- System Details --
Details:
Minecraft Version: 1.9.2
Operating System: Windows 8.1 (amd64) version 6.3
Java Version: 1.8.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 577964552 bytes (551 MB) / 695730176 bytes (663 MB) up to 10498867200 bytes (10012 MB)
JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx11G
IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
Launched Version: 1.9.2
LWJGL: 2.9.4
OpenGL: GeForce GTX 770M/PCIe/SSE2 GL version 4.5.0 NVIDIA 364.72, NVIDIA Corporation
GL Caps: Using GL 1.3 multitexturing.
Using GL 1.3 texture combiners.
Using framebuffer objects because OpenGL 3.0 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:
Current Language: English (US)
Profiler Position: N/A (disabled)
CPU: 8x Intel(R) Core(TM) i7-4700MQ CPU @ 2.40GHz

And i only had optifine on no other mods

According to hopper, the only people (including you) who have this crash are playing on a modded server, with the implication being that it is either a bug in the server mod, or perhaps you are missing a client mod in order to be compatible with the server.

http://hopper.minecraft.net/crashes/minecraft/MCX-2762463/#tab_crash-info

so how do i fix it