Could not load plugins/Friendlies.jar in plugins: null
org.bukkit.plugin.InvalidPluginException
	at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:79)
	at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:117)
	at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:82)
	at org.bukkit.craftbukkit.CraftServer.loadPlugins(CraftServer.java:53)
	at net.minecraft.server.MinecraftServer.e(MinecraftServer.java:171)
	at net.minecraft.server.MinecraftServer.c(MinecraftServer.java:158)
	at net.minecraft.server.MinecraftServer.d(MinecraftServer.java:110)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:209)
	at net.minecraft.server.ThreadServerApplication.run(SourceFile:512)
Caused by: java.lang.NoSuchMethodException: com.fullwall.Friendlies.Friendlies.<init>(org.bukkit.plugin.PluginLoader, org.bukkit.Server, org.bukkit.plugin.PluginDescriptionFile, java.io.File, java.io.File, java.lang.ClassLoader)
	at java.lang.Class.getConstructor0(Class.java:2706)
	at java.lang.Class.getConstructor(Class.java:1657)
	at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:75)
	... 8 more