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java.lang.IllegalArgumentException: Cannot set to an empty path	at org.apache.commons.lang.Validate.notEmpty(Validate.java:321)	at org.bukkit.configuration.MemorySection.set(MemorySection.java:167)	at org.bukkit.configuration.MemorySection.set(MemorySection.java:201)	at com.wasteofplastic.askyblock.Players.save(Players.java:259)	at com.wasteofplastic.askyblock.PlayerCache.save(PlayerCache.java:473)	at com.wasteofplastic.askyblock.listeners.JoinLeaveEvents.onPlayerJoin(JoinLeaveEvents.java:299)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:498)	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:302)	at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)	at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502)	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487)	at net.minecraft.server.v1_11_R1.PlayerList.onPlayerJoin(PlayerList.java:327)	at net.minecraft.server.v1_11_R1.PlayerList.a(PlayerList.java:160)	at net.minecraft.server.v1_11_R1.LoginListener.b(LoginListener.java:147)	at net.minecraft.server.v1_11_R1.LoginListener.F_(LoginListener.java:57)	at net.minecraft.server.v1_11_R1.NetworkManager.a(NetworkManager.java:233)	at net.minecraft.server.v1_11_R1.ServerConnection.c(ServerConnection.java:140)	at net.minecraft.server.v1_11_R1.MinecraftServer.D(MinecraftServer.java:834)	at net.minecraft.server.v1_11_R1.DedicatedServer.D(DedicatedServer.java:399)	at net.minecraft.server.v1_11_R1.MinecraftServer.C(MinecraftServer.java:675)	at net.minecraft.server.v1_11_R1.MinecraftServer.run(MinecraftServer.java:574)	at java.lang.Thread.run(Thread.java:745)