dchat error

[20:33:08] [Server thread/ERROR]: Error occurred while enabling DeluxeChat v1.6.3 (Is it up to date?)
java.lang.NoClassDefFoundError: com/massivecraft/factions/iface/RelationParticipator
	at me.clip.deluxechat.DeluxeChat.initializeHooks(DeluxeChat.java:468) ~[?:?]
	at me.clip.deluxechat.DeluxeChat.onEnable(DeluxeChat.java:201) ~[?:?]
	at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:321) ~[spigot-1.8.7.jar:git-PaperSpigot-477b22d-53fac9f]
	at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:340) [spigot-1.8.7.jar:git-PaperSpigot-477b22d-53fac9f]
	at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:405) [spigot-1.8.7.jar:git-PaperSpigot-477b22d-53fac9f]
	at org.bukkit.craftbukkit.v1_8_R3.CraftServer.loadPlugin(CraftServer.java:357) [spigot-1.8.7.jar:git-PaperSpigot-477b22d-53fac9f]
	at org.bukkit.craftbukkit.v1_8_R3.CraftServer.enablePlugins(CraftServer.java:317) [spigot-1.8.7.jar:git-PaperSpigot-477b22d-53fac9f]
	at net.minecraft.server.v1_8_R3.MinecraftServer.s(MinecraftServer.java:408) [spigot-1.8.7.jar:git-PaperSpigot-477b22d-53fac9f]
	at net.minecraft.server.v1_8_R3.MinecraftServer.k(MinecraftServer.java:372) [spigot-1.8.7.jar:git-PaperSpigot-477b22d-53fac9f]
	at net.minecraft.server.v1_8_R3.MinecraftServer.a(MinecraftServer.java:327) [spigot-1.8.7.jar:git-PaperSpigot-477b22d-53fac9f]
	at net.minecraft.server.v1_8_R3.DedicatedServer.init(DedicatedServer.java:267) [spigot-1.8.7.jar:git-PaperSpigot-477b22d-53fac9f]
	at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:560) [spigot-1.8.7.jar:git-PaperSpigot-477b22d-53fac9f]
	at java.lang.Thread.run(Thread.java:745) [?:1.7.0_75]
Caused by: java.lang.ClassNotFoundException: com.massivecraft.factions.iface.RelationParticipator
	at java.net.URLClassLoader$1.run(URLClassLoader.java:366) ~[?:1.7.0_75]
	at java.net.URLClassLoader$1.run(URLClassLoader.java:355) ~[?:1.7.0_75]
	at java.security.AccessController.doPrivileged(Native Method) ~[?:1.7.0_75]
	at java.net.URLClassLoader.findClass(URLClassLoader.java:354) ~[?:1.7.0_75]
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:101) ~[spigot-1.8.7.jar:git-PaperSpigot-477b22d-53fac9f]
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:86) ~[spigot-1.8.7.jar:git-PaperSpigot-477b22d-53fac9f]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:425) ~[?:1.7.0_75]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:358) ~[?:1.7.0_75]
	... 13 more