Crash report

The server got updated recently, and I was having alot of crashes, and this didn't happened when it was in 1.6.4. Minecraft told me to inform the server so here is the crash report. (When it crashed i was in Skyblock) Hope you can help me out.

---- Minecraft Crash Report ----
// I feel sad now :(

Time: 19/11/13 17:40
Description: Unexpected error

java.lang.ClassCastException: us cannot be cast to xl
at biv.a(SourceFile:469)
at ft.a(SourceFile:44)
at ft.a(SourceFile:10)
at ef.a(SourceFile:164)
at biy.e(SourceFile:212)
at azd.o(SourceFile:1281)
at azd.ad(SourceFile:753)
at azd.e(SourceFile:704)
at net.minecraft.client.main.Main.main(SourceFile:103)


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

-- Head --
Stacktrace:
at biv.a(SourceFile:469)
at ft.a(SourceFile:44)
at ft.a(SourceFile:10)
at ef.a(SourceFile:164)
at biy.e(SourceFile:212)

-- Affected level --
Details:
Level name: MpServer
All players: 1 total; [bje['Lambo993'/10325014, l='MpServer', x=5755.78, y=20.62, z=2434.00]]
Chunk stats: MultiplayerChunkCache: 49, 49
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (6957,20,38147), Chunk: (at 13,1,3 in 434,2384; contains blocks 6944,0,38144 to 6959,255,38159), Region: (13,74; contains chunks 416,2368 to 447,2399, blocks 6656,0,37888 to 7167,255,38399)
Level time: 128225621 game time, 128225621 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: 42 total; [bje['Lambo993'/10325014, l='MpServer', x=5755.78, y=20.62, z=2434.00], wz['Spider'/10330988, l='MpServer', x=5782.00, y=43.00, z=2450.50], us['Chicken'/-2147483567, l='MpServer', x=2750.93, y=19.19, z=5748.98], wx['Skeleton'/10327936, l='MpServer', x=5780.50, y=43.00, z=2438.50], wl['Creeper'/10328854, l='MpServer', x=5787.56, y=43.00, z=2439.56], wz['Spider'/10329993, l='MpServer', x=5781.78, y=43.00, z=2438.63], wz['Spider'/10329994, l='MpServer', x=5782.53, y=43.00, z=2448.59], wl['Creeper'/10326242, l='MpServer', x=5786.63, y=43.00, z=2438.91], wz['Spider'/10330463, l='MpServer', x=5782.50, y=43.00, z=2445.50], wz['Spider'/10330461, l='MpServer', x=5785.16, y=43.00, z=2449.81], us['Chicken'/10325022, l='MpServer', x=5739.56, y=19.00, z=2450.81], us['Chicken'/10325023, l='MpServer', x=5739.16, y=19.00, z=2455.22], us['Chicken'/10325020, l='MpServer', x=5743.44, y=18.50, z=2451.80], us['Chicken'/10325021, l='MpServer', x=5738.81, y=19.00, z=2454.53], us['Chicken'/10325018, l='MpServer', x=5739.97, y=19.00, z=2450.78], us['Chicken'/10325019, l='MpServer', x=5738.78, y=19.00, z=2451.53], us['Chicken'/10325017, l='MpServer', x=5739.47, y=19.00, z=2455.22], wl['Creeper'/10329010, l='MpServer', x=5787.50, y=43.00, z=2449.50], us['Chicken'/10325029, l='MpServer', x=5740.63, y=18.50, z=2451.47], us['Chicken'/10325028, l='MpServer', x=5740.19, y=18.50, z=2452.19], us['Chicken'/10325031, l='MpServer', x=5744.81, y=18.50, z=2452.13], us['Chicken'/10325030, l='MpServer', x=5744.47, y=18.50, z=2450.78], us['Chicken'/10325025, l='MpServer', x=5743.22, y=18.50, z=2451.19], us['Chicken'/10325024, l='MpServer', x=5742.19, y=19.00, z=2450.84], us['Chicken'/10325027, l='MpServer', x=5744.41, y=18.50, z=2454.47], us['Chicken'/10325026, l='MpServer', x=5744.53, y=19.00, z=2455.19], wl['Creeper'/10330465, l='MpServer', x=5784.81, y=43.00, z=2451.00], wz['Spider'/10325037, l='MpServer', x=5783.75, y=43.00, z=2435.78], wl['Creeper'/10325036, l='MpServer', x=5781.50, y=43.00, z=2437.41], xc['Zombie'/10331980, l='MpServer', x=5750.50, y=47.00, z=2420.50], wl['Creeper'/10325033, l='MpServer', x=5788.31, y=18.50, z=2442.31], us['Chicken'/10325032, l='MpServer', x=5745.41, y=18.00, z=2449.56], wl['Creeper'/10325035, l='MpServer', x=5783.00, y=43.00, z=2434.50], wl['Creeper'/10325034, l='MpServer', x=5787.69, y=43.00, z=2447.69], xc['Zombie'/10326689, l='MpServer', x=5785.50, y=43.00, z=2434.50], wl['Creeper'/10325045, l='MpServer', x=5783.16, y=43.00, z=2438.16], xc['Zombie'/10325040, l='MpServer', x=5787.50, y=43.00, z=2441.50], xc['Zombie'/10327863, l='MpServer', x=5786.50, y=43.00, z=2440.50], xc['Zombie'/10327862, l='MpServer', x=5786.50, y=43.00, z=2441.50], wz['Spider'/10325043, l='MpServer', x=5786.44, y=43.00, z=2437.63], wl['Creeper'/10331182, l='MpServer', x=5785.06, y=43.00, z=2436.78], wz['Spider'/10327864, l='MpServer', x=5787.34, y=43.00, z=2445.94]]
Retry entities: 0 total; []
Server brand: craftbukkit
Server type: Non-integrated multiplayer server
Stacktrace:
at biz.a(SourceFile:284)
at azd.b(SourceFile:1951)
at azd.e(SourceFile:718)
at net.minecraft.client.main.Main.main(SourceFile:103)

-- System Details --
Details:
Minecraft Version: 1.7.2
Operating System: Windows 8 (amd64) version 6.2
Java Version: 1.7.0_07, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 208586456 bytes (198 MB) / 275382272 bytes (262 MB) up to 954466304 bytes (910 MB)
JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
AABB Pool Size: 979 (54824 bytes; 0 MB) allocated, 2 (112 bytes; 0 MB) used
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
Launched Version: 1.7.2
LWJGL: 2.9.0
OpenGL: Intel(R) HD Graphics 4000 GL version 4.0.0 - Build 9.17.10.2932, Intel
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)
Vec3 Pool Size: 320 (17920 bytes; 0 MB) allocated, 16 (896 bytes; 0 MB) used
Anisotropic Filtering: Off (1)








Also, there's also a glitch in skyblock. Sometime's, when I type /warp shop or /spawn, I die immediately when I reached the shop. I wasn't falling or even walking. My friend TROYZORG also experienced this glitch.

 

This is only happening because of the server's unstable state. It should be over soon, you have to bear with it.

 

Ok thanks for the advice :)

 

Please go to the report bugs section and report it there