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

Solutions on the web

via GitHub by Herocraftgm
, 1 year ago
net/minecraftforge/fml/relauncher/IFMLLoadingPlugin
via GitHub by crakiMDH
, 1 year ago
net/minecraftforge/fml/relauncher/IFMLLoadingPlugin
via GitHub by KuronoaYoshiaki
, 2 years ago
net/minecraftforge/fml/relauncher/IFMLLoadingPlugin
via GitHub by grimnik
, 1 year ago
net/minecraftforge/fml/relauncher/IFMLLoadingPlugin
via co.jp by Unknown author, 2 years ago
java.lang.NoClassDefFoundError: net/minecraftforge/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 cpw.mods.fml.relauncher.CoreModManager.loadCoreMod(CoreModManager.java:460)	at cpw.mods.fml.relauncher.CoreModManager.discoverCoreMods(CoreModManager.java:389)	at cpw.mods.fml.relauncher.CoreModManager.handleLaunch(CoreModManager.java:221)	at cpw.mods.fml.relauncher.FMLLaunchHandler.setupHome(FMLLaunchHandler.java:90)	at cpw.mods.fml.relauncher.FMLLaunchHandler.setupClient(FMLLaunchHandler.java:67)	at cpw.mods.fml.relauncher.FMLLaunchHandler.configureForClientLaunch(FMLLaunchHandler.java:34)	at cpw.mods.fml.common.launcher.FMLTweaker.injectIntoClassLoader(FMLTweaker.java:126)	at net.minecraft.launchwrapper.Launch.launch(Launch.java:115)	at net.minecraft.launchwrapper.Launch.main(Launch.java:28)