dicefurnitureerror

[02:20:16] [Server thread/ERROR]: Error occurred while enabling DiceFurniture v2.4.1 (Is it up to date?)
java.lang.NoClassDefFoundError: de/Ste3et_C0st/FurnitureLib/main/Type$PlaceableSide
	at de.Ste3et_C0st.Furniture.Main.main.onEnable(main.java:85) ~[?:?]
	at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:321) ~[paperspigot-1.8.8.jar:git-PaperSpigot-4a647dc-18fbb24]
	at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:340) [paperspigot-1.8.8.jar:git-PaperSpigot-4a647dc-18fbb24]
	at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:405) [paperspigot-1.8.8.jar:git-PaperSpigot-4a647dc-18fbb24]
	at org.bukkit.craftbukkit.v1_8_R3.CraftServer.loadPlugin(CraftServer.java:357) [paperspigot-1.8.8.jar:git-PaperSpigot-4a647dc-18fbb24]
	at org.bukkit.craftbukkit.v1_8_R3.CraftServer.enablePlugins(CraftServer.java:317) [paperspigot-1.8.8.jar:git-PaperSpigot-4a647dc-18fbb24]
	at net.minecraft.server.v1_8_R3.MinecraftServer.s(MinecraftServer.java:408) [paperspigot-1.8.8.jar:git-PaperSpigot-4a647dc-18fbb24]
	at net.minecraft.server.v1_8_R3.MinecraftServer.k(MinecraftServer.java:372) [paperspigot-1.8.8.jar:git-PaperSpigot-4a647dc-18fbb24]
	at net.minecraft.server.v1_8_R3.MinecraftServer.a(MinecraftServer.java:327) [paperspigot-1.8.8.jar:git-PaperSpigot-4a647dc-18fbb24]
	at net.minecraft.server.v1_8_R3.DedicatedServer.init(DedicatedServer.java:267) [paperspigot-1.8.8.jar:git-PaperSpigot-4a647dc-18fbb24]
	at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:561) [paperspigot-1.8.8.jar:git-PaperSpigot-4a647dc-18fbb24]
	at java.lang.Thread.run(Thread.java:745) [?:1.8.0_31]
Caused by: java.lang.ClassNotFoundException: de.Ste3et_C0st.FurnitureLib.main.Type$PlaceableSide
	at java.net.URLClassLoader$1.run(URLClassLoader.java:372) ~[?:1.8.0_31]
	at java.net.URLClassLoader$1.run(URLClassLoader.java:361) ~[?:1.8.0_31]
	at java.security.AccessController.doPrivileged(Native Method) ~[?:1.8.0_31]
	at java.net.URLClassLoader.findClass(URLClassLoader.java:360) ~[?:1.8.0_31]
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:101) ~[paperspigot-1.8.8.jar:git-PaperSpigot-4a647dc-18fbb24]
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:86) ~[paperspigot-1.8.8.jar:git-PaperSpigot-4a647dc-18fbb24]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_31]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_31]
	... 12 more