java.lang.ClassCastException: ahw cannot be cast to ahn
at aqo.a(SourceFile:148)
at aqv$a.c(SourceFile:373)
at aym.a(SourceFile:107)
at aym.a(SourceFile:127)
at aym.a(SourceFile:82)
at ayk.a(SourceFile:82)
at ayk.a(SourceFile:40)
at ayk.a(SourceFile:30)
at vb.a(SourceFile:89)
at va.a(SourceFile:53)
at vb.a(SourceFile:68)
at vb.a(SourceFile:122)
at ty.c(SourceFile:53)
at th.a(SourceFile:102)
at ry.cd(SourceFile:631)
at rx.n(SourceFile:1688)
at ry.n(SourceFile:484)
at rl.n(SourceFile:134)
at vs.n(SourceFile:41)
at wg.n(SourceFile:881)
at rx.m(SourceFile:1550)
at ry.m(SourceFile:275)
at wg.m(SourceFile:914)
at ahn.a(SourceFile:1481)
at lq.a(SourceFile:719)
at ahn.g(SourceFile:1459)
at ahn.k(SourceFile:1349)
at lq.k(SourceFile:552)
at net.minecraft.server.MinecraftServer.D(SourceFile:618)
at net.minecraft.server.MinecraftServer.C(SourceFile:546)
at bxx.C(SourceFile:154)
at net.minecraft.server.MinecraftServer.run(SourceFile:450)
at java.lang.Thread.run(Thread.java:745)
A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------
-- Head --
Stacktrace:
at aqo.a(SourceFile:148)
at aqv$a.c(SourceFile:373)
at aym.a(SourceFile:107)
at aym.a(SourceFile:127)
at aym.a(SourceFile:82)
at ayk.a(SourceFile:82)
at ayk.a(SourceFile:40)
at ayk.a(SourceFile:30)
at vb.a(SourceFile:89)
at va.a(SourceFile:53)
at vb.a(SourceFile:68)
at vb.a(SourceFile:122)
at ty.c(SourceFile:53)
at th.a(SourceFile:102)
at ry.cd(SourceFile:631)
at rx.n(SourceFile:1688)
at ry.n(SourceFile:484)
at rl.n(SourceFile:134)
at vs.n(SourceFile:41)
at wg.n(SourceFile:881)
at rx.m(SourceFile:1550)
at ry.m(SourceFile:275)
at wg.m(SourceFile:914)
at ahn.a(SourceFile:1481)
at lq.a(SourceFile:719)
at ahn.g(SourceFile:1459)
-- Entity being ticked --
Details:
Entity Type: EntityHorse (wg)
Entity ID: 648555
Entity Name: Horse
Entity's Exact location: -571.65, 56.00, 12.38
Entity's Block location: World: (-572,56,12), Chunk: (at 4,3,12 in -36,0; contains blocks -576,0,0 to -561,255,15), Region: (-2,0; contains chunks -64,0 to -33,31, blocks -1024,0,0 to -513,255,511)
Entity's Momentum: 0.00, -0.08, 0.01
Entity's Passengers: []
Entity's Vehicle: ~~ERROR~~ NullPointerException: null
Stacktrace:
at ahn.k(SourceFile:1349)
at lq.k(SourceFile:552)
-- Affected level --
Details:
Level name: World 08
All players: 1 total; [ls['Lou9896'/90712, l='World 08', x=-573.30, y=64.29, z=10.27]]
Chunk stats: ServerChunkCache: 1521 Drop: 0
Level seed: -1358420340576365820
Level generator: ID 01 - flat, ver 0. Features enabled: true
Level generator options: 3;minecraft:bedrock,3*minecraft:stone,52*minecraft:sandstone;2;
Level spawn location: World: (-568,4,-2), Chunk: (at 8,0,14 in -36,-1; contains blocks -576,0,-16 to -561,255,-1), Region: (-2,-1; contains chunks -64,-32 to -33,-1, blocks -1024,0,-512 to -513,255,-1)
Level time: 36875 game time, 11604 day time
Level dimension: 0
Level storage version: 0x04ABD - Anvil
Level weather: Rain time: 115859 (now: false), thunder time: 31484 (now: false)
Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: true
Stacktrace:
at net.minecraft.server.MinecraftServer.D(SourceFile:618)
at net.minecraft.server.MinecraftServer.C(SourceFile:546)
at bxx.C(SourceFile:154)
at net.minecraft.server.MinecraftServer.run(SourceFile:450)
at java.lang.Thread.run(Thread.java:745)
-- System Details --
Details:
Minecraft Version: 15w45a
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: 1170870112 bytes (1116 MB) / 2123890688 bytes (2025 MB) up to 2123890688 bytes (2025 MB)
JVM Flags: 3 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx2G -Xms2G
IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
Profiler Position: N/A (disabled)
Player Count: 1 / 8; [ls['Lou9896'/90712, l='World 08', x=-573.30, y=64.29, z=10.27]]
Type: Integrated Server (map_client.txt)
Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.
The crash report is above I have no idea why minecraft did this.
You world wasn't actually deleted, but the level.dat file was corrupted and as a result the save no longer shows up (you may see an error in the game output about a file not being in GZip format or the like). It is possible to rescue it by creating a new world with the same name and seed; luckily, the crash report gives you the seed and other important information (I've seen this information be blank before):
Level name: World 08
Level seed: -1358420340576365820
Level generator: ID 01 - flat, ver 0. Features enabled: true
Level generator options: 3;minecraft:bedrock,3*minecraft:stone,52*minecraft:sandstone;2;
Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: true
You might have chunk corruption issues though, and items in your inventory may be lost if player.dat is also corrupted, as well as your spawn point (the game mode is Creative though so those probably aren't an issue; the world spawn point should be the same). Also, use 15w46a, which appears to have fixed the crash (see link given by SeaWry's).
---- Minecraft Crash Report ----
// Ouch. That hurt
Time: 11/12/15 11:04 PM
Description: Ticking entity
java.lang.ClassCastException: ahw cannot be cast to ahn
at aqo.a(SourceFile:148)
at aqv$a.c(SourceFile:373)
at aym.a(SourceFile:107)
at aym.a(SourceFile:127)
at aym.a(SourceFile:82)
at ayk.a(SourceFile:82)
at ayk.a(SourceFile:40)
at ayk.a(SourceFile:30)
at vb.a(SourceFile:89)
at va.a(SourceFile:53)
at vb.a(SourceFile:68)
at vb.a(SourceFile:122)
at ty.c(SourceFile:53)
at th.a(SourceFile:102)
at ry.cd(SourceFile:631)
at rx.n(SourceFile:1688)
at ry.n(SourceFile:484)
at rl.n(SourceFile:134)
at vs.n(SourceFile:41)
at wg.n(SourceFile:881)
at rx.m(SourceFile:1550)
at ry.m(SourceFile:275)
at wg.m(SourceFile:914)
at ahn.a(SourceFile:1481)
at lq.a(SourceFile:719)
at ahn.g(SourceFile:1459)
at ahn.k(SourceFile:1349)
at lq.k(SourceFile:552)
at net.minecraft.server.MinecraftServer.D(SourceFile:618)
at net.minecraft.server.MinecraftServer.C(SourceFile:546)
at bxx.C(SourceFile:154)
at net.minecraft.server.MinecraftServer.run(SourceFile:450)
at java.lang.Thread.run(Thread.java:745)
A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------
-- Head --
Stacktrace:
at aqo.a(SourceFile:148)
at aqv$a.c(SourceFile:373)
at aym.a(SourceFile:107)
at aym.a(SourceFile:127)
at aym.a(SourceFile:82)
at ayk.a(SourceFile:82)
at ayk.a(SourceFile:40)
at ayk.a(SourceFile:30)
at vb.a(SourceFile:89)
at va.a(SourceFile:53)
at vb.a(SourceFile:68)
at vb.a(SourceFile:122)
at ty.c(SourceFile:53)
at th.a(SourceFile:102)
at ry.cd(SourceFile:631)
at rx.n(SourceFile:1688)
at ry.n(SourceFile:484)
at rl.n(SourceFile:134)
at vs.n(SourceFile:41)
at wg.n(SourceFile:881)
at rx.m(SourceFile:1550)
at ry.m(SourceFile:275)
at wg.m(SourceFile:914)
at ahn.a(SourceFile:1481)
at lq.a(SourceFile:719)
at ahn.g(SourceFile:1459)
-- Entity being ticked --
Details:
Entity Type: EntityHorse (wg)
Entity ID: 648555
Entity Name: Horse
Entity's Exact location: -571.65, 56.00, 12.38
Entity's Block location: World: (-572,56,12), Chunk: (at 4,3,12 in -36,0; contains blocks -576,0,0 to -561,255,15), Region: (-2,0; contains chunks -64,0 to -33,31, blocks -1024,0,0 to -513,255,511)
Entity's Momentum: 0.00, -0.08, 0.01
Entity's Passengers: []
Entity's Vehicle: ~~ERROR~~ NullPointerException: null
Stacktrace:
at ahn.k(SourceFile:1349)
at lq.k(SourceFile:552)
-- Affected level --
Details:
Level name: World 08
All players: 1 total; [ls['Lou9896'/90712, l='World 08', x=-573.30, y=64.29, z=10.27]]
Chunk stats: ServerChunkCache: 1521 Drop: 0
Level seed: -1358420340576365820
Level generator: ID 01 - flat, ver 0. Features enabled: true
Level generator options: 3;minecraft:bedrock,3*minecraft:stone,52*minecraft:sandstone;2;
Level spawn location: World: (-568,4,-2), Chunk: (at 8,0,14 in -36,-1; contains blocks -576,0,-16 to -561,255,-1), Region: (-2,-1; contains chunks -64,-32 to -33,-1, blocks -1024,0,-512 to -513,255,-1)
Level time: 36875 game time, 11604 day time
Level dimension: 0
Level storage version: 0x04ABD - Anvil
Level weather: Rain time: 115859 (now: false), thunder time: 31484 (now: false)
Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: true
Stacktrace:
at net.minecraft.server.MinecraftServer.D(SourceFile:618)
at net.minecraft.server.MinecraftServer.C(SourceFile:546)
at bxx.C(SourceFile:154)
at net.minecraft.server.MinecraftServer.run(SourceFile:450)
at java.lang.Thread.run(Thread.java:745)
-- System Details --
Details:
Minecraft Version: 15w45a
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: 1170870112 bytes (1116 MB) / 2123890688 bytes (2025 MB) up to 2123890688 bytes (2025 MB)
JVM Flags: 3 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx2G -Xms2G
IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
Profiler Position: N/A (disabled)
Player Count: 1 / 8; [ls['Lou9896'/90712, l='World 08', x=-573.30, y=64.29, z=10.27]]
Type: Integrated Server (map_client.txt)
Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.
The crash report is above I have no idea why minecraft did this.
https://bugs.mojang.com/browse/MC-92144
Snapshots have bugs. Expect them. Don't use them for your main primary game.
You world wasn't actually deleted, but the level.dat file was corrupted and as a result the save no longer shows up (you may see an error in the game output about a file not being in GZip format or the like). It is possible to rescue it by creating a new world with the same name and seed; luckily, the crash report gives you the seed and other important information (I've seen this information be blank before):
Level name: World 08
Level seed: -1358420340576365820
Level generator: ID 01 - flat, ver 0. Features enabled: true
Level generator options: 3;minecraft:bedrock,3*minecraft:stone,52*minecraft:sandstone;2;
Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: true
You might have chunk corruption issues though, and items in your inventory may be lost if player.dat is also corrupted, as well as your spawn point (the game mode is Creative though so those probably aren't an issue; the world spawn point should be the same). Also, use 15w46a, which appears to have fixed the crash (see link given by SeaWry's).
TheMasterCaver's First World - possibly the most caved-out world in Minecraft history - includes world download.
TheMasterCaver's World - my own version of Minecraft largely based on my views of how the game should have evolved since 1.6.4.
Why do I still play in 1.6.4?