launches fine crashes once you join a server

Incomplete without a crash report from ([minecraft/crash-reports/crash-<DATE>-client.txt|http://hopper.minecraft.net/help/finding-minecraft-data-folder]). Please attach it so that we can diagnose your issue.
Likely a duplicate of MC-103978.

Minecraft Crash Report ----
// I let you down. Sorry 😞

Time: 6/22/16 3:09 PM
Description: Server forgot to send required information to construct BlockEntity

java.lang.RuntimeException: Missing BlockEntity
at bqy.b(SourceFile:162)
at bqu.a(SourceFile:100)
at bqu.run(SourceFile:43)
at java.lang.Thread.run(Thread.java:745)

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

– BlockEntity missing instance data –
Details:
BlockState: minecraft:piston_extension[facing=down,type=normal]
Block coordinates: World: (-514,16,-191), Chunk: (at 14,1,1 in -33,-12; contains blocks -528,0,-192 to -513,255,-177), Region: (-2,-1; contains chunks -64,-32 to -33,-1, blocks -1024,0,-512 to -513,255,-1)

– Affected level –
Details:
Level name: MpServer
All players: 9 total; [bnn['YrU_NvS'/2207135, l='MpServer', x=-554.56, y=5.00, z=-249.93], bno['Craw'/1153, l='MpServer', x=-536.49, y=1.00, z=-261.32], bno['BrandsPickled'/1171, l='MpServer', x=-531.73, y=1.00, z=-261.30], bno['King_RyRy'/1177, l='MpServer', x=-530.63, y=1.00, z=-261.32], bno['MaxxyRoy'/1195, l='MpServer', x=-535.31, y=1.00, z=-261.30], bno['Slayer'/1198, l='MpServer', x=-580.92, y=5.00, z=-256.45], bno['Farmer'/1844, l='MpServer', x=-565.50, y=6.00, z=-206.19], bno['Lumberjack'/1972, l='MpServer', x=-512.20, y=7.00, z=-203.27], bno['Fisherman'/2076, l='MpServer', x=-599.24, y=5.00, z=-205.90]]
Chunk stats: MultiplayerChunkCache: 289, 289
Level seed: 0
Level generator: ID 01 - flat, ver 0. Features enabled: false
Level generator options:
Level spawn location: World: (7595,68,2629), Chunk: (at 11,4,5 in 474,164; contains blocks 7584,0,2624 to 7599,255,2639), Region: (14,5; contains chunks 448,160 to 479,191, blocks 7168,0,2560 to 7679,255,3071)
Level time: 693639308 game time, 106345446083 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: 53 total; [bnn['YrU_NvS'/2207135, l='MpServer', x=-554.56, y=5.00, z=-249.93], bno['Craw'/1153, l='MpServer', x=-536.49, y=1.00, z=-261.32], bno['Craw'/1153, l='MpServer', x=-536.49, y=1.00, z=-261.32], bno['BrandsPickled'/1171, l='MpServer', x=-531.73, y=1.00, z=-261.30], bno['King_RyRy'/1177, l='MpServer', x=-530.63, y=1.00, z=-261.32], bno['MaxxyRoy'/1195, l='MpServer', x=-535.31, y=1.00, z=-261.30], xx['§5§l§nQuest'/782, l='MpServer', x=-512.28, y=9.66, z=-203.44], xx['§5§l§nQuest'/783, l='MpServer', x=-531.26, y=7.33, z=-298.79], xx['§5§l§nQuest'/785, l='MpServer', x=-581.35, y=8.64, z=-256.53], bno['Slayer'/1198, l='MpServer', x=-580.92, y=5.00, z=-256.45], xx['§5§l§nQuest'/786, l='MpServer', x=-565.73, y=9.54, z=-206.17], bno['BrandsPickled'/1171, l='MpServer', x=-531.73, y=1.00, z=-261.30], xx['§5§l§nQuest'/787, l='MpServer', x=-599.08, y=7.35, z=-205.87], xx['§3Welcome to §a§lKaos§2§lCraft'/2127157, l='MpServer', x=-523.80, y=7.48, z=-215.56], xx['§aUpgrade your account instantly'/789, l='MpServer', x=-542.95, y=8.60, z=-298.74], xx['§bThis is a §cPvP§b Towny Server'/2127158, l='MpServer', x=-523.80, y=7.23, z=-215.56], xx['§aat §fwww.kaoscraft.co.uk/store§a!'/790, l='MpServer', x=-542.95, y=8.35, z=-298.74], xx['§3Check out our website §aKaos§2Craft§a.co.uk'/2127159, l='MpServer', x=-523.80, y=6.98, z=-215.56], xx['§aUpgrade your account instantly'/791, l='MpServer', x=-611.94, y=8.60, z=-259.04], xx['§bRemember to §9/vote§b to get amazing loot!'/2127160, l='MpServer', x=-523.80, y=6.73, z=-215.56], xx['§aat §fwww.kaoscraft.co.uk/store§a!'/792, l='MpServer', x=-611.94, y=8.35, z=-259.04], bno['King_RyRy'/1177, l='MpServer', x=-530.63, y=1.00, z=-261.32], xx['§3Lastly Have Fun!'/2127161, l='MpServer', x=-523.80, y=6.48, z=-215.56], bno['Farmer'/1844, l='MpServer', x=-565.50, y=6.00, z=-206.19], bno['Fisherman'/2076, l='MpServer', x=-599.24, y=5.00, z=-205.90], xx['§9-x-§a§l Crates §9-x-'/798, l='MpServer', x=-617.22, y=9.25, z=-248.48], xx['§9-x-§a§l Ranks §9-x-'/799, l='MpServer', x=-516.39, y=7.68, z=-299.70], xx['§9-x- §a§lRules§9 x'/806, l='MpServer', x=-553.44, y=9.97, z=-195.62], bno['Lumberjack'/1972, l='MpServer', x=-512.20, y=7.00, z=-203.27], xx['§9-x- §a§lEnchant §9-x-'/808, l='MpServer', x=-551.05, y=7.72, z=-243.98], xx['§9-x- §a§lVote §9-x-'/809, l='MpServer', x=-524.52, y=8.53, z=-192.00], bno['MaxxyRoy'/1195, l='MpServer', x=-535.31, y=1.00, z=-261.30], bno['Fisherman'/2076, l='MpServer', x=-599.24, y=5.00, z=-205.90], bno['Slayer'/1198, l='MpServer', x=-580.92, y=5.00, z=-256.45], xx['§3Welcome to §a§lKaos§2§lCraft'/817, l='MpServer', x=-539.40, y=7.48, z=-200.33], xx['§bThis is a §cPvP§b Towny Server'/818, l='MpServer', x=-539.40, y=7.23, z=-200.33], xx['§3Check out our website §aKaos§2Craft§a.co.uk'/819, l='MpServer', x=-539.40, y=6.98, z=-200.33], bno['Farmer'/1844, l='MpServer', x=-565.50, y=6.00, z=-206.19], xx['§bRemember to §9/vote§b to get amazing loot!'/820, l='MpServer', x=-539.40, y=6.73, z=-200.33], bno['Lumberjack'/1972, l='MpServer', x=-512.20, y=7.00, z=-203.27], xx['§3Lastly Have Fun!'/821, l='MpServer', x=-539.40, y=6.48, z=-200.33], xx['§3Welcome to §a§lKaos§2§lCraft'/827, l='MpServer', x=-539.54, y=7.48, z=-230.57], xx['§bThis is a §cPvP§b Towny Server'/828, l='MpServer', x=-539.54, y=7.23, z=-230.57], xx['§3Check out our website §aKaos§2Craft§a.co.uk'/829, l='MpServer', x=-539.54, y=6.98, z=-230.57], xx['§bRemember to §9/vote§b to get amazing loot!'/830, l='MpServer', x=-539.54, y=6.73, z=-230.57], xx['§3Lastly Have Fun!'/831, l='MpServer', x=-539.54, y=6.48, z=-230.57], xx['§bRemember to select §a§l3 §bJobs'/832, l='MpServer', x=-507.33, y=7.68, z=-212.47], xx['§3As well as a Skill!'/833, l='MpServer', x=-507.33, y=7.43, z=-212.47], xx['§3Welcome to §a§lKaos§2§lCraft'/2127465, l='MpServer', x=-554.72, y=7.48, z=-215.30], xx['§bThis is a §cPvP§b Towny Server'/2127466, l='MpServer', x=-554.72, y=7.23, z=-215.30], xx['§3Check out our website §aKaos§2Craft§a.co.uk'/2127467, l='MpServer', x=-554.72, y=6.98, z=-215.30], xx['§bRemember to §9/vote§b to get amazing loot!'/2127468, l='MpServer', x=-554.72, y=6.73, z=-215.30], xx['§3Lastly Have Fun!'/2127469, l='MpServer', x=-554.72, y=6.48, z=-215.30]]
Retry entities: 0 total; []
Server brand: Spigot
Server type: Non-integrated multiplayer server
Stacktrace:
at bln.a(SourceFile:364)
at bcx.b(SourceFile:2535)
at bqu.run(SourceFile:49)
at java.lang.Thread.run(Thread.java:745)

– System Details –
Details:
Minecraft Version: 1.10.1
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.8.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 97089848 bytes (92 MB) / 258007040 bytes (246 MB) up to 1060372480 bytes (1011 MB)
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
Launched Version: 1.10.1
LWJGL: 2.9.4
OpenGL: ~_ERROR~ RuntimeException: No OpenGL context found in the current thread.
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: Yes
Is Modded: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Resource Packs:
Current Language: English (Canada)
Profiler Position: N/A (disabled)
CPU: 6x AMD FX(tm)-6100 Six-Core Processor