Posted July 4, 201510 yr everytime i try to launch Forge 1.7.10 i get the following message [19:08:10] [main/ERROR] [FML]: An error occurred trying to configure the minecraft home at C:\Users\Nathan Gaudet\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-1.11.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:417) ~[forge-1.7.10-10.13.4.1448-1.7.10.jar:?] at cpw.mods.fml.relauncher.CoreModManager.discoverCoreMods(CoreModManager.java:346) ~[forge-1.7.10-10.13.4.1448-1.7.10.jar:?] at cpw.mods.fml.relauncher.CoreModManager.handleLaunch(CoreModManager.java:214) ~[forge-1.7.10-10.13.4.1448-1.7.10.jar:?] at cpw.mods.fml.relauncher.FMLLaunchHandler.setupHome(FMLLaunchHandler.java:90) [forge-1.7.10-10.13.4.1448-1.7.10.jar:?] at cpw.mods.fml.relauncher.FMLLaunchHandler.setupClient(FMLLaunchHandler.java:67) [forge-1.7.10-10.13.4.1448-1.7.10.jar:?] at cpw.mods.fml.relauncher.FMLLaunchHandler.configureForClientLaunch(FMLLaunchHandler.java:34) [forge-1.7.10-10.13.4.1448-1.7.10.jar:?] at cpw.mods.fml.common.launcher.FMLTweaker.injectIntoClassLoader(FMLTweaker.java:126) [forge-1.7.10-10.13.4.1448-1.7.10.jar:?] at net.minecraft.launchwrapper.Launch.launch(Launch.java:115) [launchwrapper-1.11.jar:?] at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.11.jar:?] Caused by: java.lang.ClassNotFoundException: net.minecraftforge.fml.relauncher.IFMLLoadingPlugin at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191) ~[launchwrapper-1.11.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-1.11.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] any form of help would be greatly appreciated. Also, I feel i should mention that I was able to download and run 1.8 with no problems
July 4, 201510 yr You have a 1.8 mod installed, trying to load 1.7 with a 1.8 mod will not work most of the time.
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