PartyAndFriendsGUI] Enabling PartyAndFriendsGUI v1.0.42
[04:34:15] [Server thread/ERROR]: Error occurred while enabling PartyAndFriendsGUI v1.0.42 (Is it up to date?)
java.lang.NoClassDefFoundError: com/google/gson/Gson
	at de.simonsator.partyandfriendsgui.communication.BungeecordCommunication.<init>(BungeecordCommunication.java:21) ~[?:?]
	at de.simonsator.partyandfriendsgui.Main.onEnable(Main.java:49) ~[?:?]
	at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:316) ~[spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
	at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:332) [spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
	at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:412) [spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
	at org.bukkit.craftbukkit.v1_7_R4.CraftServer.loadPlugin(CraftServer.java:476) [spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
	at org.bukkit.craftbukkit.v1_7_R4.CraftServer.enablePlugins(CraftServer.java:394) [spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
	at net.minecraft.server.v1_7_R4.MinecraftServer.n(MinecraftServer.java:360) [spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
	at net.minecraft.server.v1_7_R4.MinecraftServer.g(MinecraftServer.java:334) [spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
	at net.minecraft.server.v1_7_R4.MinecraftServer.a(MinecraftServer.java:290) [spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
	at net.minecraft.server.v1_7_R4.DedicatedServer.init(DedicatedServer.java:210) [spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
	at net.minecraft.server.v1_7_R4.MinecraftServer.run(MinecraftServer.java:458) [spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
	at net.minecraft.server.v1_7_R4.ThreadServerApplication.run(SourceFile:628) [spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
Caused by: java.lang.ClassNotFoundException: com.google.gson.Gson
	at java.net.URLClassLoader.findClass(URLClassLoader.java:381) ~[?:1.8.0_74]
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:101) ~[spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:86) ~[spigot.jar:git-Spigot-1.7.9-R0.2-207-g03373bb]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_74]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_74]
	... 13 more