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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 stevedbarlow
, 1 year ago
java.lang.NoClassDefFoundError: net/minecraftforge/client/event/GuiScreenEvent$InitGuiEv ent$Post
via gutefrage.net by Unknown author, 1 year ago
java.lang.NoClassDefFoundError: net/minecraft/client/Minecraft
via gutefrage.net by Unknown author, 1 year ago
via GitHub by gdude2002
, 1 year ago
java.lang.NoClassDefFoundError: net/minecraft/client/Minecraft
via GitHub by tiarnia
, 8 months ago
java.lang.NoClassDefFoundError: net/minecraft/client/renderer/texture/TextureMap
via minecraftforge.net by Unknown author, 2 years ago
java.lang.NoClassDefFoundError: net/minecraft/client/entity/EntityPlayerSP
java.lang.NoClassDefFoundError: net/minecraftforge/client/event/GuiScreenEvent$InitGuiEvent	at java.lang.ClassLoader.defineClass1(Native Method)	at java.lang.ClassLoader.defineClass(ClassLoader.java:763)