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  1. ,
    via minecraftforum.net by Unknown author

    The stack trace shows which mod caused the problem (in my case it was at com.pahimar.ee3.reference.Textures.<clinit>, so the mod in question is EE3). Remove or reinstall that mod.

Solutions on the web

via GitHub by xeloxxleox
, 1 year ago
mixac1/dangerrpg/client/gui/GuiRPGWorkbench 4:32:50 PM at mixac1.dangerrpg.inventory.ContainerRPGWorkbench.<init>(ContainerRPGWorkbench.java:38) ~[ContainerRPGWorkbench.class:?] 4:32:50 PM at mixac1.dangerrpg.init.RPGGuiHandlers.getServerGuiElement(RPGGuiHandlers.java:38) ~[RPGGuiHandlers.class:?]
java.lang.RuntimeException: Attempted to load class mixac1/dangerrpg/client/gui/GuiRPGWorkbench for invalid side SERVER	at cpw.mods.fml.common.asm.transformers.SideTransformer.transform(SideTransformer.java:50)	at net.minecraft.launchwrapper.LaunchClassLoader.runTransformers(LaunchClassLoader.java:279)	at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:176)	at java.lang.ClassLoader.loadClass(ClassLoader.java:424)	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)	at java.lang.ClassLoader.loadClass(ClassLoader.java:424)	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)	at cpw.mods.fml.common.network.NetworkRegistry.getRemoteGuiContainer(NetworkRegistry.java:243)	at cpw.mods.fml.common.network.internal.FMLNetworkHandler.openGui(FMLNetworkHandler.java:75)	at net.minecraft.entity.player.EntityPlayer.openGui(Unknown Source)	at mixac1.dangerrpg.block.BlockRPGWorkbench.func_149727_a(BlockRPGWorkbench.java:54)	at net.minecraft.server.management.ItemInWorldManager.func_73078_a(Unknown Source)	at net.minecraft.network.NetHandlerPlayServer.func_147346_a(NetHandlerPlayServer.java:556)	at net.minecraft.network.play.client.C08PacketPlayerBlockPlacement.func_148833_a(SourceFile:60)	at net.minecraft.network.play.client.C08PacketPlayerBlockPlacement.func_148833_a(SourceFile:9)	at net.minecraft.network.NetworkManager.func_74428_b(NetworkManager.java:212)	at net.minecraft.network.NetworkSystem.func_151269_c(NetworkSystem.java:165)	at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:659)	at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:334)	at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:547)	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:396)	at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:685)