java.lang.NoClassDefFoundError: org/apache/commons/io/IOUtils

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java.lang.ClassNotFoundException: org.apache.commons.io.IOUtils
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:101)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at com.minelazz.epicworldgenerator.structures.EpicStructureManager.(Unknown Source)
at com.minelazz.epicworldgenerator.u$0.(Unknown Source)
at com.minelazz.epicworldgenerator.u.onLoad(Unknown Source)
at com.minelazz.epicworldgenerator.EpicWorldGenerator.onLoad(Unknown Source)
at org.bukkit.craftbukkit.v1_7_R4.CraftServer.loadPlugins(CraftServer.java:374)
at net.minecraft.server.v1_7_R4.DedicatedServer.init(DedicatedServer.java:152)
at net.minecraft.server.v1_7_R4.MinecraftServer.run(MinecraftServer.java:458)

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