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Minecraft crashes as it is loading a world. That is about it. Here is the crash report in full.


---- Minecraft Crash Report ----
// This doesn't make any sense!

Time: 6/20/13 7:28 PM
Description: Exception in server tick loop

java.lang.ClassCastException: aov cannot be cast to alb
at alc.<init>(SourceFile:33)
at alb.a(SourceFile:374)
at alb.a(SourceFile:334)
at abw.a(SourceFile:394)
at aab.f(SourceFile:302)
at agw.a(SourceFile:384)
at agw.a(SourceFile:513)
at aen.a(SourceFile:393)
at agy.a(SourceFile:29)
at ags.a(SourceFile:73)
at acy.a(SourceFile:422)
at iy.a(SourceFile:165)
at abw.a(SourceFile:728)
at iy.c(SourceFile:104)
at ix.<init>(SourceFile:26)
at iw.a(SourceFile:172)
at iw.a(SourceFile:203)
at gu.a(SourceFile:138)
at gu.c(SourceFile:185)
at gu.a(SourceFile:82)
at bjj.b(SourceFile:73)
at net.minecraft.server.MinecraftServer.r(SourceFile:480)
at net.minecraft.server.MinecraftServer.q(SourceFile:397)
at bjg.q(SourceFile:122)
at net.minecraft.server.MinecraftServer.run(SourceFile:331)
at gp.run(SourceFile:573)


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

-- System Details --
Details:
Minecraft Version: 1.5.2
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.7.0_21, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 721667912 bytes (688 MB) / 891748352 bytes (850 MB) up to 954466304 bytes (910 MB)
JVM Flags: 2 total; -Xms512m -Xmx1024m
AABB Pool Size: 2610 (146160 bytes; 0 MB) allocated, 2610 (146160 bytes; 0 MB) used
Suspicious classes: No suspicious classes found.
IntCache: cache: 0, tcache: 0, allocated: 1, tallocated: 63
Profiler Position: N/A (disabled)
Vec3 Pool Size: 315 (17640 bytes; 0 MB) allocated, 315 (17640 bytes; 0 MB) used
Player Count: 1 / 8; [jc['D4rK3sTsH4d0W'/200, l='hunter and i', x=-113.15, y=92.27, z=-28.88]]
Type: Integrated Server (map_client.txt)
Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.

Quote from cestislife

Tried a force update?
To do so, start Minecraft, press 'Options' (above the 'Login' button), Press 'Force update!', then press 'Done', and login to Minecraft. See http://i.imgur.com/5b09B.png for visual instructions.

I have tried that, It had no affect. It still crashes while loading a world

Quote from cestislife

Does this happen to a specific world?

Yes, the world must be corrupt or something. good thing it is not an important world.

If u don't can fix it with MC-Edit upload u world and we will try to fix it for u.
(Pleas compress world first, at best with "winrar")

;-)

I fixed the world. Thankyou for the help!

I have been having a problem kinda related to this. When I log on to a world, it will load for about a minute, then crash. When i log back on to minecraft, the world has been deleted. It is also nonexistent in the app data file. This has happened a few times now, and i can see no pattern in the crashes. I am now scared to go onto any of my good worlds in case they are deleted. I have had minecraft for around a year, and this has never happened before. My update is minecraft 1.7.2 with launcher 1.3.1. My computer is an VAIO laptop with an i5 core running Windows 8. Please help!

Make copy of u world first, start u world with MC 1.6.4 (Mojang says that this version change some world settings for the new bioms in 1.7.2) If u have visit all buildings of u world u can change to 1.7.2)