Authme crash

Could not save config to players.yml
java.io.FileNotFoundException: ./plugins/AuthMe/players.yml (Too many open files)
	at java.io.FileOutputStream.open(Native Method)
	at java.io.FileOutputStream.<init>(Unknown Source)
	at java.io.FileOutputStream.<init>(Unknown Source)
	at java.io.FileWriter.<init>(Unknown Source)
	at org.bukkit.configuration.file.FileConfiguration.save(FileConfiguration.java:56)
	at uk.org.whoami.authme.settings.CustomConfiguration.save(CustomConfiguration.java:52)
	at uk.org.whoami.authme.listener.AuthMePlayerListener.onPlayerQuit(AuthMePlayerListener.java:821)
	at sun.reflect.GeneratedMethodAccessor267.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:425)
	at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
	at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:477)
	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:462)
	at net.minecraft.server.v1_4_R1.PlayerList.disconnect(PlayerList.java:209)
	at net.minecraft.server.v1_4_R1.PlayerConnection.a(PlayerConnection.java:717)
	at net.minecraft.server.v1_4_R1.NetworkManager.b(NetworkManager.java:295)
	at net.minecraft.server.v1_4_R1.PlayerConnection.d(PlayerConnection.java:113)
	at net.minecraft.server.v1_4_R1.ServerConnection.b(SourceFile:39)
	at net.minecraft.server.v1_4_R1.DedicatedServerConnection.b(SourceFile:30)
	at net.minecraft.server.v1_4_R1.MinecraftServer.r(MinecraftServer.java:598)
	at net.minecraft.server.v1_4_R1.DedicatedServer.r(DedicatedServer.java:224)
	at net.minecraft.server.v1_4_R1.MinecraftServer.q(MinecraftServer.java:494)
	at net.minecraft.server.v1_4_R1.MinecraftServer.run(MinecraftServer.java:427)
	at net.minecraft.server.v1_4_R1.ThreadServerApplication.run(SourceFile:849)