[Server thread/INFO]: [CraftHeads] Enabling CraftHeads v2.1.1
[18:32:07] [Server thread/ERROR]: Error occurred while enabling CraftHeads v2.1.1 (Is it up to date?)
java.lang.NoClassDefFoundError: java/util/function/Consumer
	at me.deejayarroba.craftheads.Main.onEnable(Main.java:52) ~[?:?]
	at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:321) ~[custom.jar:git-Spigot-db6de12-18fbb24]
	at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:340) [custom.jar:git-Spigot-db6de12-18fbb24]
	at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:405) [custom.jar:git-Spigot-db6de12-18fbb24]
	at org.bukkit.craftbukkit.v1_8_R3.CraftServer.loadPlugin(CraftServer.java:357) [custom.jar:git-Spigot-db6de12-18fbb24]
	at org.bukkit.craftbukkit.v1_8_R3.CraftServer.enablePlugins(CraftServer.java:317) [custom.jar:git-Spigot-db6de12-18fbb24]
	at net.minecraft.server.v1_8_R3.MinecraftServer.s(MinecraftServer.java:414) [custom.jar:git-Spigot-db6de12-18fbb24]
	at net.minecraft.server.v1_8_R3.MinecraftServer.k(MinecraftServer.java:378) [custom.jar:git-Spigot-db6de12-18fbb24]
	at net.minecraft.server.v1_8_R3.MinecraftServer.a(MinecraftServer.java:333) [custom.jar:git-Spigot-db6de12-18fbb24]
	at net.minecraft.server.v1_8_R3.DedicatedServer.init(DedicatedServer.java:263) [custom.jar:git-Spigot-db6de12-18fbb24]
	at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:525) [custom.jar:git-Spigot-db6de12-18fbb24]
	at java.lang.Thread.run(Thread.java:745) [?:1.7.0_79]
Caused by: java.lang.ClassNotFoundException: java.util.function.Consumer
	at java.net.URLClassLoader$1.run(URLClassLoader.java:366) ~[?:1.7.0_79]
	at java.net.URLClassLoader$1.run(URLClassLoader.java:355) ~[?:1.7.0_79]
	at java.security.AccessController.doPrivileged(Native Method) ~[?:1.7.0_79]
	at java.net.URLClassLoader.findClass(URLClassLoader.java:354) ~[?:1.7.0_79]
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:101) ~[custom.jar:git-Spigot-db6de12-18fbb24]
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:86) ~[custom.jar:git-Spigot-db6de12-18fbb24]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:425) ~[?:1.7.0_79]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:358) ~[?:1.7.0_79]
	... 12 more