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I try to launch Minecraft, and this is what outputs:

 

[20:10:00] [main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.common.launcher.FMLTweaker

[20:10:00] [main/INFO] [LaunchWrapper]: Using primary tweak class name cpw.mods.fml.common.launcher.FMLTweaker

[20:10:00] [main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.common.launcher.FMLTweaker

[20:10:00] [main/INFO] [FML]: Forge Mod Loader version 7.99.36.1558 for Minecraft 1.7.10 loading

[20:10:00] [main/INFO] [FML]: Java is Java HotSpot 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

[20:10:00] [main/INFO] [FML]: [AppEng] Core Init

[20:10:00] [main/INFO] [FML]: Loading tweaker me.guichaguri.betterfps.tweaker.BetterFpsTweaker from BetterFps-1.0.1.jar

[20:10:00] [main/WARN] [FML]: The coremod codechicken.core.launch.CodeChickenCorePlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft

[20:10:00] [main/WARN] [FML]: The coremod cofh.asm.LoadingPlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft

[20:10:00] [main/INFO] [FML]: Loading tweaker forestry.shade.javacheck.Java7Checker from forestry_1.7.10-4.2.5.53.jar

[20:10:00] [main/WARN] [FML]: The coremod codechicken.core.launch.DepLoader does not have a MCVersion annotation, it may cause issues with this version of Minecraft

[20:10:00] [main/WARN] [FML]: The coremod mrtjp.relocation.asm.RelocationPlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft

[20:10:00] [main/WARN] [FML]: The coremod invtweaks.forge.asm.FMLPlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft

[20:10:00] [main/WARN] [FML]: The coremod mrtjp.core.handler.CorePlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft

[20:10:00] [main/WARN] [FML]: The coremod mrtjp.core.handler.CorePlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft

[20:10:00] [main/WARN] [FML]: The coremod codechicken.nei.asm.NEICorePlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft

[20:10:00] [main/WARN] [FML]: The coremod openblocks.OpenBlocksCorePlugin does not have a MCVersion annotation, it may cause issues with this version of Minecraft

[20:10:00] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: java.lang.NoClassDefFoundError: net/minecraftforge/fml/relauncher/IFMLLoadingPlugin

[20:10:00] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at java.lang.ClassLoader.defineClass1(Native Method)

[20:10:00] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at java.lang.ClassLoader.defineClass(ClassLoader.java:760)

[20:10:00] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)

[20:10:00] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at java.net.URLClassLoader.defineClass(URLClassLoader.java:455)

[20:10:00] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at java.net.URLClassLoader.access$100(URLClassLoader.java:73)

[20:10:00] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at java.net.URLClassLoader$1.run(URLClassLoader.java:367)

[20:10:00] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at java.net.URLClassLoader$1.run(URLClassLoader.java:361)

[20:10:00] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at java.security.AccessController.doPrivileged(Native Method)

[20:10:00] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at java.net.URLClassLoader.findClass(URLClassLoader.java:360)

[20:10:00] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:117)

[20:10:00] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at java.lang.ClassLoader.loadClass(ClassLoader.java:424)

[20:10:00] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at java.lang.ClassLoader.loadClass(ClassLoader.java:357)

[20:10:00] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at java.lang.Class.forName0(Native Method)

[20:10:00] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at java.lang.Class.forName(Class.java:344)

[20:10:00] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at cpw.mods.fml.relauncher.CoreModManager.loadCoreMod(CoreModManager.java:460)

[20:10:00] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at cpw.mods.fml.relauncher.CoreModManager.discoverCoreMods(CoreModManager.java:389)

[20:10:00] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at cpw.mods.fml.relauncher.CoreModManager.handleLaunch(CoreModManager.java:221)

[20:10:00] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at cpw.mods.fml.relauncher.FMLLaunchHandler.setupHome(FMLLaunchHandler.java:90)

[20:10:00] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at cpw.mods.fml.relauncher.FMLLaunchHandler.setupClient(FMLLaunchHandler.java:67)

[20:10:00] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at cpw.mods.fml.relauncher.FMLLaunchHandler.configureForClientLaunch(FMLLaunchHandler.java:34)

[20:10:00] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at cpw.mods.fml.common.launcher.FMLTweaker.injectIntoClassLoader(FMLTweaker.java:126)

[20:10:00] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at net.minecraft.launchwrapper.Launch.launch(Launch.java:115)

[20:10:00] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

[20:10:00] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: Caused by: java.lang.ClassNotFoundException: net.minecraftforge.fml.relauncher.IFMLLoadingPlugin

[20:10:00] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191)

[20:10:00] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at java.lang.ClassLoader.loadClass(ClassLoader.java:424)

[20:10:00] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at java.lang.ClassLoader.loadClass(ClassLoader.java:357)

[20:10:00] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: ... 23 more

[20:10:00] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: Caused by: java.lang.NullPointerException

[20:10:00] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:182)

[20:10:00] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: ... 25 more

[20:10:00] [main/ERROR] [FML]: An error occurred trying to configure the minecraft home at C:\Users\Paolo\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-1.7.10-10.13.4.1558-1.7.10.jar:?]

at cpw.mods.fml.relauncher.CoreModManager.discoverCoreMods(CoreModManager.java:389) ~[forge-1.7.10-10.13.4.1558-1.7.10.jar:?]

at cpw.mods.fml.relauncher.CoreModManager.handleLaunch(CoreModManager.java:221) ~[forge-1.7.10-10.13.4.1558-1.7.10.jar:?]

at cpw.mods.fml.relauncher.FMLLaunchHandler.setupHome(FMLLaunchHandler.java:90) [forge-1.7.10-10.13.4.1558-1.7.10.jar:?]

at cpw.mods.fml.relauncher.FMLLaunchHandler.setupClient(FMLLaunchHandler.java:67) [forge-1.7.10-10.13.4.1558-1.7.10.jar:?]

at cpw.mods.fml.relauncher.FMLLaunchHandler.configureForClientLaunch(FMLLaunchHandler.java:34) [forge-1.7.10-10.13.4.1558-1.7.10.jar:?]

at cpw.mods.fml.common.launcher.FMLTweaker.injectIntoClassLoader(FMLTweaker.java:126) [forge-1.7.10-10.13.4.1558-1.7.10.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" [20:10:00] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: java.lang.NoClassDefFoundError: net/minecraftforge/fml/relauncher/IFMLLoadingPlugin

[20:10:00] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at java.lang.ClassLoader.defineClass1(Native Method)

[20:10:00] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at java.lang.ClassLoader.defineClass(ClassLoader.java:760)

[20:10:00] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)

[20:10:00] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at java.net.URLClassLoader.defineClass(URLClassLoader.java:455)

[20:10:00] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at java.net.URLClassLoader.access$100(URLClassLoader.java:73)

[20:10:00] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at java.net.URLClassLoader$1.run(URLClassLoader.java:367)

[20:10:00] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at java.net.URLClassLoader$1.run(URLClassLoader.java:361)

[20:10:00] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at java.security.AccessController.doPrivileged(Native Method)

[20:10:00] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at java.net.URLClassLoader.findClass(URLClassLoader.java:360)

[20:10:00] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:117)

[20:10:00] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at java.lang.ClassLoader.loadClass(ClassLoader.java:424)

[20:10:00] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at java.lang.ClassLoader.loadClass(ClassLoader.java:357)

[20:10:00] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at java.lang.Class.forName0(Native Method)

[20:10:00] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at java.lang.Class.forName(Class.java:344)

[20:10:00] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at cpw.mods.fml.relauncher.CoreModManager.loadCoreMod(CoreModManager.java:460)

[20:10:00] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at cpw.mods.fml.relauncher.CoreModManager.discoverCoreMods(CoreModManager.java:389)

[20:10:00] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at cpw.mods.fml.relauncher.CoreModManager.handleLaunch(CoreModManager.java:221)

[20:10:00] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at cpw.mods.fml.relauncher.FMLLaunchHandler.setupHome(FMLLaunchHandler.java:90)

[20:10:00] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at cpw.mods.fml.relauncher.FMLLaunchHandler.setupClient(FMLLaunchHandler.java:67)

[20:10:00] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at cpw.mods.fml.relauncher.FMLLaunchHandler.configureForClientLaunch(FMLLaunchHandler.java:34)

[20:10:00] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at cpw.mods.fml.common.launcher.FMLTweaker.injectIntoClassLoader(FMLTweaker.java:126)

[20:10:00] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at net.minecraft.launchwrapper.Launch.launch(Launch.java:115)

[20:10:00] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

[20:10:00] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: Caused by: java.lang.ClassNotFoundException: net.minecraftforge.fml.relauncher.IFMLLoadingPlugin

[20:10:00] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191)

[20:10:00] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at java.lang.ClassLoader.loadClass(ClassLoader.java:424)

[20:10:00] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at java.lang.ClassLoader.loadClass(ClassLoader.java:357)

[20:10:00] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: ... 23 more

[20:10:00] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: Caused by: java.lang.NullPointerException

[20:10:00] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:182)

[20:10:00] [main/INFO] [sTDERR]: [java.lang.Throwable$WrappedPrintStream:println:748]: ... 25 more

 

Posted
java.lang.NoClassDefFoundError: net/minecraftforge/fml/relauncher/IFMLLoadingPlugin

 

You're trying to use a coremod built for 1.8+ on 1.7.10, this won't work.

 

If you post the actual FML log (logs/fml-client-latest.log), I can probably tell you which mod this is. Upload the log to Gist and link it here.

Please don't PM me to ask for help. Asking your question in a public thread preserves it for people who are having the same problem in the future.

Posted
[20:15:56] [main/DEBUG] [FML/]: Examining for coremod candidacy OpenComputers-MC1.8.9-1.5.21.1.jar

[20:15:56] [main/TRACE] [FML/]: Found FMLCorePluginContainsFMLMod marker in OpenComputers-MC1.8.9-1.5.21.1.jar, it will be examined later for regular @Mod instances

[20:15:56] [main/DEBUG] [FML/]: Instantiating coremod class TransformerLoader

[20:15:56] [main/INFO] [sTDERR/]: [java.lang.Throwable$WrappedPrintStream:println:748]: java.lang.NoClassDefFoundError: net/minecraftforge/fml/relauncher/IFMLLoadingPlugin

 

You've installed a 1.8.9 version of OpenComputers.

Please don't PM me to ask for help. Asking your question in a public thread preserves it for people who are having the same problem in the future.

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