Minecraft Forums

I just build a new PC and transferred my saved worlds to it. They were all built with an older version so I set the launcher to 1.7.9. The game loads and I am able to select worlds. Upon selecting one of the imported worlds, the game says that it is loading and building terrain. Then it crashes. It works for levels I just created; I tested amplified mode for fun and it loaded with no issues. Any idea what the problem could be? Thanks!

---- Minecraft Crash Report ----
// Why is it breaking

Time: 4/1/15 4:05 PM
Description: Unexpected error

java.lang.IndexOutOfBoundsException
at java.nio.Buffer.checkIndex(Buffer.java:540)
at java.nio.DirectIntBufferU.get(DirectIntBufferU.java:253)
at bom.a(SourceFile:271)
at bom.a(SourceFile:220)
at ban.a(SourceFile:1694)
at ban.a(SourceFile:1652)
at bln.a(SourceFile:123)
at hd.a(SourceFile:70)
at hd.a(SourceFile:13)
at ej.a(SourceFile:174)
at ban.p(SourceFile:1585)
at ban.ak(SourceFile:774)
at ban.f(SourceFile:728)
at net.minecraft.client.main.Main.main(SourceFile:148)

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

-- Head --
Stacktrace:
at java.nio.Buffer.checkIndex(Buffer.java:540)
at java.nio.DirectIntBufferU.get(DirectIntBufferU.java:253)
at bom.a(SourceFile:271)
at bom.a(SourceFile:220)
at ban.a(SourceFile:1694)
at ban.a(SourceFile:1652)
at bln.a(SourceFile:123)
at hd.a(SourceFile:70)
at hd.a(SourceFile:13)
at ej.a(SourceFile:174)

-- Affected level --
Details:
Level name: MpServer
All players: 0 total; []
Chunk stats: MultiplayerChunkCache: 0, 0
Level seed: 0
Level generator: ID 01 - flat, ver 0. Features enabled: false
Level generator options:
Level spawn location: World: (8,64,8), Chunk: (at 8,4,8 in 0,0; contains blocks 0,0,0 to 15,255,15), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 0 game time, 0 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: creative (ID 1). Hardcore: false. Cheats: false
Forced entities: 0 total; []
Retry entities: 0 total; []
Server brand: ~~ERROR~~ NullPointerException: null
Server type: Integrated singleplayer server
Stacktrace:
at blr.a(SourceFile:289)
at ban.b(SourceFile:1972)
at ban.f(SourceFile:742)
at net.minecraft.client.main.Main.main(SourceFile:148)

-- System Details --
Details:
Minecraft Version: 1.7.9
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: 154768600 bytes (147 MB) / 255066112 bytes (243 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
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
Launched Version: 1.7.9
LWJGL: 2.9.1
OpenGL: GeForce GTX 970/PCIe/SSE2 GL version 4.5.0 NVIDIA 347.88, NVIDIA Corporation
GL Caps: Using GL 1.3 multitexturing.
Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported.
Anisotropic filtering is supported and maximum anisotropy is 16.
Shaders are available because OpenGL 2.1 is supported.

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: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Anisotropic Filtering: Off (1)

You need to load 1.8 and change your render distance to 16 chunks or less; you appear to have the issue mentioned here, not sure why it only crashes on existing worlds but the crash report is nearly identical to the one shown in the link.

Also, there is no reason not to load 1.7 worlds in 1.8; there are no significant changes in world generation (i.e. ones that will cause cliffs where biomes mismatch, like between 1.6.4 and 1.7.2).

You should also create a new profile if you run multiple versions of the game, much worse things including serious world corruption (especially when going from 1.8 to an older version) can occur if you accidentally backport a world (possibly also because the game crashes due to the issue here), also change the "game directory" in the profile editor so worlds and configuration files are saved in different locations.