Minecraft Forums

When i open minecraft crash and say this

---- Minecraft Crash Report ----
// My bad.

Time: 10/01/16 19:49
Description: Initializing game

java.lang.NoClassDefFoundError: paulscode/sound/libraries/LibraryLWJGLOpenAL
at btj.<init>(SourceFile:66)
at btp.<init>(SourceFile:63)
at bao.ag(SourceFile:381)
at bao.f(SourceFile:713)
at net.minecraft.client.main.Main.main(SourceFile:148)
Caused by: java.lang.ClassNotFoundException: paulscode.sound.libraries.LibraryLWJGLOpenAL
at java.net.URLClassLoader$1.run(URLClassLoader.java:372)
at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:360)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 5 more

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

-- Head --
Stacktrace:
at btj.<init>(SourceFile:66)
at btp.<init>(SourceFile:63)
at bao.ag(SourceFile:381)

-- Initialization --
Details:
Stacktrace:
at bao.f(SourceFile:713)
at net.minecraft.client.main.Main.main(SourceFile:148)

-- System Details --
Details:
Minecraft Version: 1.7.10
Operating System: Windows 7 (x86) version 6.1
Java Version: 1.8.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 30846600 bytes (29 MB) / 125042688 bytes (119 MB) up to 523501568 bytes (499 MB)
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M -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: 1.7.10
LWJGL: 2.9.1
OpenGL: ATI Radeon HD 5400 Series GL version 4.1.10524 Compatibility Profile Context, ATI Technologies Inc.
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: [Minecraftia V.2.0.zip]
Current Language: Español (Argentina)
Profiler Position: N/A (disabled)
Vec3 Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Anisotropic Filtering: Off (1)

-CAN SOMEONE HELP ME

Why did this happen? Are you using forge? Is your computer bad?

I believe it's something to do with your internet connection. A java class isn't being loaded properly/doesn't exist. (The missing class is paulscode.sound.libraries.LibraryLWJGLOpenAL if you were curious)

Try running Minecraft again, and let it download the required assets for Minecraft.

If you run into trouble again, please copy the launcher log from the Launcher Log tab as well. As much as possible, when asking for help include that as well.