Minecraft Forums

installed single player commands and minecraft crashes trying to load world,

---- Minecraft Crash Report ----
// Surprise! Haha. Well, this is awkward.

Time: 6/27/15 2:53 PM
Description: Updating screen events

java.lang.NoClassDefFoundError: Could not initialize class el
at ave.a(SourceFile:1944)
at axb.a(SourceFile:210)
at axu.a(SourceFile:350)
at axb.a(SourceFile:350)
at axu.k(SourceFile:413)
at axu.p(SourceFile:390)
at ave.s(SourceFile:1497)
at ave.av(SourceFile:888)
at ave.a(SourceFile:325)
at net.minecraft.client.main.Main.main(SourceFile:124)

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

-- Head --
Stacktrace:
at ave.a(SourceFile:1944)
at axb.a(SourceFile:210)
at axu.a(SourceFile:350)
at axb.a(SourceFile:350)
at axu.k(SourceFile:413)
at axu.p(SourceFile:390)

-- Affected screen --
Details:
Screen name: aya
Stacktrace:
at ave.s(SourceFile:1497)
at ave.av(SourceFile:888)
at ave.a(SourceFile:325)
at net.minecraft.client.main.Main.main(SourceFile:124)

-- System Details --
Details:
Minecraft Version: 1.8.7
Operating System: Windows 8.1 (amd64) version 6.3
CPU: 4x Intel(R) Pentium(R) CPU N3540 @ 2.16GHz
Java Version: 1.8.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 70609376 bytes (67 MB) / 294023168 bytes (280 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: 13, tallocated: 99
Launched Version: 1.8.7_spc
LWJGL: 2.9.4
OpenGL: Intel(R) HD Graphics GL version 4.0.0 - Build 10.18.10.3408, Intel
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: No
Is Modded: Very likely; Jar signature invalidated
Type: Client (map_client.txt)
Resource Packs: []
Current Language: English (US)
Profiler Position: N/A (disabled)