java.lang.NoClassDefFoundError

tip

Look if your classpath is correct, and check if the versions of your libraries match the version you described in your pom.xml

You have a different solution? A short tip here would help you and many other users who saw this issue last week.

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    • java.lang.NoClassDefFoundError: cpw/mods/fml/relauncher/IFMLLoadingPlugin at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:760) at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) at java.net.URLClassLoader.defineClass(URLClassLoader.java:455) at java.net.URLClassLoader.access$100(URLClassLoader.java:73) at java.net.URLClassLoader$1.run(URLClassLoader.java:367) 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 net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:117) at java.lang.ClassLoader.loadClass(ClassLoader.java:424) at java.lang.ClassLoader.loadClass(ClassLoader.java:357) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:344) at net.minecraftforge.fml.relauncher.CoreModManager.loadCoreMod(CoreModManager.java:447) at net.minecraftforge.fml.relauncher.CoreModManager.discoverCoreMods(CoreModManager.java:371) at net.minecraftforge.fml.relauncher.CoreModManager.handleLaunch(CoreModManager.java:239) at net.minecraftforge.fml.relauncher.FMLLaunchHandler.setupHome(FMLLaunchHandler.java:90) at net.minecraftforge.fml.relauncher.FMLLaunchHandler.setupClient(FMLLaunchHandler.java:67) at net.minecraftforge.fml.relauncher.FMLLaunchHandler.configureForClientLaunch(FMLLaunchHandler.java:34) at net.minecraftforge.fml.common.launcher.FMLTweaker.injectIntoClassLoader(FMLTweaker.java:125) at net.minecraft.launchwrapper.Launch.launch(Launch.java:115) at net.minecraft.launchwrapper.Launch.main(Launch.java:28)[22:48:49]

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