Mod error problems - Java Edition Support - Support - Minecraft Forum

#1 Jun 22, 2016

Llamacakes

Out of the Water
Location: Louisiana
Join Date: 4/13/2016
Posts: 4
Minecraft: Llamawaffle
Member Details

Recently my minecraft has not been loading, and instead when I press
play on the launcher, it hesitates for about 4 seconds then comes up
with an error report saying something about "classloader" or something?
Please help as soon as possible. Here's the error report:

[17:22:39] [main/INFO] [LaunchWrapper]: Loading tweak class name
cpw.mods.fml.common.launcher.FMLTweaker
[17:22:39] [main/INFO] [LaunchWrapper]: Using primary tweak class name
cpw.mods.fml.common.launcher.FMLTweaker
[17:22:39] [main/INFO] [LaunchWrapper]: Calling tweak class
cpw.mods.fml.common.launcher.FMLTweaker
[17:22:39] [main/INFO] [FML]: Forge Mod Loader version 7.99.40.1614 for
Minecraft 1.7.10 loading
[17:22:39] [main/INFO] [FML]: Java is Java HotSpot(TM) 64-Bit Server VM,
version 1.8.0_25, running on Windows 10:amd64:10.0, installed at
C:\Program Files (x86)\Minecraft\runtime\jre-x64\1.8.0_25
[17:22:39] [main/WARN] [FML]: The coremod
codechicken.core.launch.CodeChickenCorePlugin does not have a MCVersion
annotation, it may cause issues with this version of Minecraft
[17:22:40] [main/INFO] [STDERR]:
[java.lang.Throwable$WrappedPrintStream:println:748]:
java.lang.NoClassDefFoundError:
net/minecraftforge/fml/relauncher/IFMLLoadingPlugin
[17:22:40] [main/INFO] [STDERR]:
[java.lang.Throwable$WrappedPrintStream:println:748]: at
java.lang.ClassLoader.defineClass1(Native Method)
[17:22:40] [main/INFO] [STDERR]:
[java.lang.Throwable$WrappedPrintStream:println:748]: at
java.lang.ClassLoader.defineClass(ClassLoader.java:760)
[17:22:40] [main/INFO] [STDERR]:
[java.lang.Throwable$WrappedPrintStream:println:748]: at
java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
[17:22:40] [main/INFO] [STDERR]:
[java.lang.Throwable$WrappedPrintStream:println:748]: at
java.net.URLClassLoader.defineClass(URLClassLoader.java:455)
[17:22:40] [main/INFO] [STDERR]:
[java.lang.Throwable$WrappedPrintStream:println:748]: at
java.net.URLClassLoader.access$100(URLClassLoader.java:73)
[17:22:40] [main/INFO] [STDERR]:
[java.lang.Throwable$WrappedPrintStream:println:748]: at
java.net.URLClassLoader$1.run(URLClassLoader.java:367)
[17:22:40] [main/INFO] [STDERR]:
[java.lang.Throwable$WrappedPrintStream:println:748]: at
java.net.URLClassLoader$1.run(URLClassLoader.java:361)
[17:22:40] [main/INFO] [STDERR]:
[java.lang.Throwable$WrappedPrintStream:println:748]: at
java.security.AccessController.doPrivileged(Native Method)
[17:22:40] [main/INFO] [STDERR]:
[java.lang.Throwable$WrappedPrintStream:println:748]: at
java.net.URLClassLoader.findClass(URLClassLoader.java:360)
[17:22:40] [main/INFO] [STDERR]:
[java.lang.Throwable$WrappedPrintStream:println:748]: at
net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:117)
[17:22:40]
[main/INFO] [STDERR]:
[java.lang.Throwable$WrappedPrintStream:println:748]: at
java.lang.ClassLoader.loadClass(ClassLoader.java:424)
[17:22:40] [main/INFO] [STDERR]:
[java.lang.Throwable$WrappedPrintStream:println:748]: at
java.lang.ClassLoader.loadClass(ClassLoader.java:357)
[17:22:40] [main/INFO] [STDERR]:
[java.lang.Throwable$WrappedPrintStream:println:748]: at
java.lang.Class.forName0(Native Method)
[17:22:40] [main/INFO] [STDERR]:
[java.lang.Throwable$WrappedPrintStream:println:748]: at
java.lang.Class.forName(Class.java:344)
[17:22:40] [main/INFO] [STDERR]:
[java.lang.Throwable$WrappedPrintStream:println:748]: at
cpw.mods.fml.relauncher.CoreModManager.loadCoreMod(CoreModManager.java:460)
[17:22:40]
[main/INFO] [STDERR]:
[java.lang.Throwable$WrappedPrintStream:println:748]: at
cpw.mods.fml.relauncher.CoreModManager.discoverCoreMods(CoreModManager.java:389)
[17:22:40]
[main/INFO] [STDERR]:
[java.lang.Throwable$WrappedPrintStream:println:748]: at
cpw.mods.fml.relauncher.CoreModManager.handleLaunch(CoreModManager.java:221)
[17:22:40]
[main/INFO] [STDERR]:
[java.lang.Throwable$WrappedPrintStream:println:748]: at
cpw.mods.fml.relauncher.FMLLaunchHandler.setupHome(FMLLaunchHandler.java:90)
[17:22:40]
[main/INFO] [STDERR]:
[java.lang.Throwable$WrappedPrintStream:println:748]: at
cpw.mods.fml.relauncher.FMLLaunchHandler.setupClient(FMLLaunchHandler.java:67)
[17:22:40]
[main/INFO] [STDERR]:
[java.lang.Throwable$WrappedPrintStream:println:748]: at
cpw.mods.fml.relauncher.FMLLaunchHandler.configureForClientLaunch(FMLLaunchHandler.java:34)
[17:22:40]
[main/INFO] [STDERR]:
[java.lang.Throwable$WrappedPrintStream:println:748]: at
cpw.mods.fml.common.launcher.FMLTweaker.injectIntoClassLoader(FMLTweaker.java:126)
[17:22:40]
[main/INFO] [STDERR]:
[java.lang.Throwable$WrappedPrintStream:println:748]: at
net.minecraft.launchwrapper.Launch.launch(Launch.java:115)
[17:22:40] [main/INFO] [STDERR]:
[java.lang.Throwable$WrappedPrintStream:println:748]: at
net.minecraft.launchwrapper.Launch.main(Launch.java:28)
[17:22:40] [main/INFO] [STDERR]:
[java.lang.Throwable$WrappedPrintStream:println:748]: Caused by:
java.lang.ClassNotFoundException:
net.minecraftforge.fml.relauncher.IFMLLoadingPlugin
[17:22:40] [main/INFO] [STDERR]:
[java.lang.Throwable$WrappedPrintStream:println:748]: at
net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191)
[17:22:40]
[main/INFO] [STDERR]:
[java.lang.Throwable$WrappedPrintStream:println:748]: at
java.lang.ClassLoader.loadClass(ClassLoader.java:424)
[17:22:40] [main/INFO] [STDERR]:
[java.lang.Throwable$WrappedPrintStream:println:748]: at
java.lang.ClassLoader.loadClass(ClassLoader.java:357)
[17:22:40] [main/INFO] [STDERR]:
[java.lang.Throwable$WrappedPrintStream:println:748]: ... 23 more
[17:22:40] [main/INFO] [STDERR]:
[java.lang.Throwable$WrappedPrintStream:println:748]: Caused by:
java.lang.NullPointerException
[17:22:40] [main/INFO] [STDERR]:
[java.lang.Throwable$WrappedPrintStream:println:748]: at
net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:182)
[17:22:40]
[main/INFO] [STDERR]:
[java.lang.Throwable$WrappedPrintStream:println:748]: ... 25 more
[17:22:40] [main/ERROR] [FML]: An error occurred trying to configure the
minecraft home at C:\Users\Colin\AppData\Roaming.minecraft for Forge
Mod Loader
java.lang.NoClassDefFoundError:
net/minecraftforge/fml/relauncher/IFMLLoadingPlugin
at java.lang.ClassLoader.defineClass1(Native Method) ~[?:1.8.0_25]
at java.lang.ClassLoader.defineClass(ClassLoader.java:760)
~[?:1.8.0_25]
at
java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
~[?:1.8.0_25]
at java.net.URLClassLoader.defineClass(URLClassLoader.java:455)
~[?:1.8.0_25]
at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
~[?:1.8.0_25]
at java.net.URLClassLoader$1.run(URLClassLoader.java:367)
~[?:1.8.0_25]
at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
~[?:1.8.0_25]
at java.security.AccessController.doPrivileged(Native Method)
~[?:1.8.0_25]
at java.net.URLClassLoader.findClass(URLClassLoader.java:360)
~[?:1.8.0_25]
at
net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:117)
~[launchwrapper-1.12.jar:?]
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
~[?:1.8.0_25]
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
~[?:1.8.0_25]
at java.lang.Class.forName0(Native Method) ~[?:1.8.0_25]
at java.lang.Class.forName(Class.java:344) ~[?:1.8.0_25]
at
cpw.mods.fml.relauncher.CoreModManager.loadCoreMod(CoreModManager.java:460)
~[forge-1.7.10-10.13.4.1614-1.7.10.jar:?]
at
cpw.mods.fml.relauncher.CoreModManager.discoverCoreMods(CoreModManager.java:389)
~[forge-1.7.10-10.13.4.1614-1.7.10.jar:?]
at
cpw.mods.fml.relauncher.CoreModManager.handleLaunch(CoreModManager.java:221)
~[forge-1.7.10-10.13.4.1614-1.7.10.jar:?]
at
cpw.mods.fml.relauncher.FMLLaunchHandler.setupHome(FMLLaunchHandler.java:90)
[forge-1.7.10-10.13.4.1614-1.7.10.jar:?]
at
cpw.mods.fml.relauncher.FMLLaunchHandler.setupClient(FMLLaunchHandler.java:67)
[forge-1.7.10-10.13.4.1614-1.7.10.jar:?]
at
cpw.mods.fml.relauncher.FMLLaunchHandler.configureForClientLaunch(FMLLaunchHandler.java:34)
[forge-1.7.10-10.13.4.1614-1.7.10.jar:?]
at
cpw.mods.fml.common.launcher.FMLTweaker.injectIntoClassLoader(FMLTweaker.java:126)
[forge-1.7.10-10.13.4.1614-1.7.10.jar:?]
at net.minecraft.launchwrapper.Launch.launch(Launch.java:115)
[launchwrapper-1.12.jar:?]
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
[launchwrapper-1.12.jar:?]
Caused by: java.lang.ClassNotFoundException:
net.minecraftforge.fml.relauncher.IFMLLoadingPlugin
at
net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191)
~[launchwrapper-1.12.jar:?]
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
~[?:1.8.0_25]
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
~[?:1.8.0_25]
... 23 more
Caused by: java.lang.NullPointerException
at
net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:182)
~[launchwrapper-1.12.jar:?]
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
~[?:1.8.0_25]
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
~[?:1.8.0_25]
... 23 more
Exception in thread "main" [17:22:40] [main/INFO] [STDERR]:
[java.lang.Throwable$WrappedPrintStream:println:748]:
java.lang.NoClassDefFoundError:
net/minecraftforge/fml/relauncher/IFMLLoadingPlugin
[17:22:40] [main/INFO] [STDERR]:
[java.lang.Throwable$WrappedPrintStream:println:748]: at
java.lang.ClassLoader.defineClass1(Native Method)
[17:22:40] [main/INFO] [STDERR]:
[java.lang.Throwable$WrappedPrintStream:println:748]: at
java.lang.ClassLoader.defineClass(ClassLoader.java:760)
[17:22:40] [main/INFO] [STDERR]:
[java.lang.Throwable$WrappedPrintStream:println:748]: at
java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
[17:22:40] [main/INFO] [STDERR]:
[java.lang.Throwable$WrappedPrintStream:println:748]: at
java.net.URLClassLoader.defineClass(URLClassLoader.java:455)
[17:22:40] [main/INFO] [STDERR]:
[java.lang.Throwable$WrappedPrintStream:println:748]: at
java.net.URLClassLoader.access$100(URLClassLoader.java:73)
[17:22:40] [main/INFO] [STDERR]:
[java.lang.Throwable$WrappedPrintStream:println:748]: at
java.net.URLClassLoader$1.run(URLClassLoader.java:367)
[17:22:40] [main/INFO] [STDERR]:
[java.lang.Throwable$WrappedPrintStream:println:748]: at
java.net.URLClassLoader$1.run(URLClassLoader.java:361)
[17:22:40] [main/INFO] [STDERR]:
[java.lang.Throwable$WrappedPrintStream:println:748]: at
java.security.AccessController.doPrivileged(Native Method)
[17:22:40] [main/INFO] [STDERR]:
[java.lang.Throwable$WrappedPrintStream:println:748]: at
java.net.URLClassLoader.findClass(URLClassLoader.java:360)
[17:22:40] [main/INFO] [STDERR]:
[java.lang.Throwable$WrappedPrintStream:println:748]: at
net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:117)
[17:22:40]
[main/INFO] [STDERR]:
[java.lang.Throwable$WrappedPrintStream:println:748]: at
java.lang.ClassLoader.loadClass(ClassLoader.java:424)
[17:22:40] [main/INFO] [STDERR]:
[java.lang.Throwable$WrappedPrintStream:println:748]: at
java.lang.ClassLoader.loadClass(ClassLoader.java:357)
[17:22:40] [main/INFO] [STDERR]:
[java.lang.Throwable$WrappedPrintStream:println:748]: at
java.lang.Class.forName0(Native Method)
[17:22:40] [main/INFO] [STDERR]:
[java.lang.Throwable$WrappedPrintStream:println:748]: at
java.lang.Class.forName(Class.java:344)
[17:22:40] [main/INFO] [STDERR]:
[java.lang.Throwable$WrappedPrintStream:println:748]: at
cpw.mods.fml.relauncher.CoreModManager.loadCoreMod(CoreModManager.java:460)
[17:22:40]
[main/INFO] [STDERR]:
[java.lang.Throwable$WrappedPrintStream:println:748]: at
cpw.mods.fml.relauncher.CoreModManager.discoverCoreMods(CoreModManager.java:389)
[17:22:40]
[main/INFO] [STDERR]:
[java.lang.Throwable$WrappedPrintStream:println:748]: at
cpw.mods.fml.relauncher.CoreModManager.handleLaunch(CoreModManager.java:221)
[17:22:40]
[main/INFO] [STDERR]:
[java.lang.Throwable$WrappedPrintStream:println:748]: at
cpw.mods.fml.relauncher.FMLLaunchHandler.setupHome(FMLLaunchHandler.java:90)
[17:22:40]
[main/INFO] [STDERR]:
[java.lang.Throwable$WrappedPrintStream:println:748]: at
cpw.mods.fml.relauncher.FMLLaunchHandler.setupClient(FMLLaunchHandler.java:67)
[17:22:40]
[main/INFO] [STDERR]:
[java.lang.Throwable$WrappedPrintStream:println:748]: at
cpw.mods.fml.relauncher.FMLLaunchHandler.configureForClientLaunch(FMLLaunchHandler.java:34)
[17:22:40]
[main/INFO] [STDERR]:
[java.lang.Throwable$WrappedPrintStream:println:748]: at
cpw.mods.fml.common.launcher.FMLTweaker.injectIntoClassLoader(FMLTweaker.java:126)
[17:22:40]
[main/INFO] [STDERR]:
[java.lang.Throwable$WrappedPrintStream:println:748]: at
net.minecraft.launchwrapper.Launch.launch(Launch.java:115)
[17:22:40] [main/INFO] [STDERR]:
[java.lang.Throwable$WrappedPrintStream:println:748]: at
net.minecraft.launchwrapper.Launch.main(Launch.java:28)
[17:22:40] [main/INFO] [STDERR]:
[java.lang.Throwable$WrappedPrintStream:println:748]: Caused by:
java.lang.ClassNotFoundException:
net.minecraftforge.fml.relauncher.IFMLLoadingPlugin
[17:22:40] [main/INFO] [STDERR]:
[java.lang.Throwable$WrappedPrintStream:println:748]: at
net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191)
[17:22:40]
[main/INFO] [STDERR]:
[java.lang.Throwable$WrappedPrintStream:println:748]: at
java.lang.ClassLoader.loadClass(ClassLoader.java:424)
[17:22:40] [main/INFO] [STDERR]:
[java.lang.Throwable$WrappedPrintStream:println:748]: at
java.lang.ClassLoader.loadClass(ClassLoader.java:357)
[17:22:40] [main/INFO] [STDERR]:
[java.lang.Throwable$WrappedPrintStream:println:748]: ... 23 more
[17:22:40] [main/INFO] [STDERR]:
[java.lang.Throwable$WrappedPrintStream:println:748]: Caused by:
java.lang.NullPointerException
[17:22:40] [main/INFO] [STDERR]:
[java.lang.Throwable$WrappedPrintStream:println:748]: at
net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:182)
[17:22:40]
[main/INFO] [STDERR]:
[java.lang.Throwable$WrappedPrintStream:println:748]: ... 25 more

#2 Jun 22, 2016

MauveCloud

Lapis Lazuli Collector
Join Date: 10/3/2014
Posts: 1,042
Location: California
Member Details

[17:22:40] [main/INFO] [STDERR]:
[java.lang.Throwable$WrappedPrintStream:println:748]:
java.lang.NoClassDefFoundError:
net/minecraftforge/fml/relauncher/IFMLLoadingPlugin

That means you have one or more mods in your mods folder for a different version of Minecraft, which won't work. If you provide a list of the files there (see http://y2u.be/Ipb18wZaPxE for how), I can try to identify which ones that applies to.

#3 Jun 22, 2016

Llamacakes

Out of the Water
Location: Louisiana
Join Date: 4/13/2016
Posts: 4
Minecraft: Llamawaffle
Member Details

I figured it out: My lucraft core mod was 1.8.9 instead of 1.7.10. Thanks!!