28.03 04:43:52 [Multicraft] Skipped 296 lines due to rate limit (30/s)
28.03 04:43:50 [Server] WARN org.bukkit.configuration.InvalidConfigurationException: Invalid JSON detected.
28.03 04:43:50 [Server] WARN at net.minecraft.server.v1_7_R1.ThreadServerApplication.run(SourceFile:617)
28.03 04:43:50 [Server] WARN at net.minecraft.server.v1_7_R1.MinecraftServer.run(MinecraftServer.java:469)
28.03 04:43:50 [Server] WARN at net.minecraft.server.v1_7_R1.MinecraftServer.t(MinecraftServer.java:562)
28.03 04:43:50 [Server] WARN at net.minecraft.server.v1_7_R1.DedicatedServer.u(DedicatedServer.java:273)
28.03 04:43:50 [Server] WARN at net.minecraft.server.v1_7_R1.MinecraftServer.u(MinecraftServer.java:700)
28.03 04:43:50 [Server] WARN at net.minecraft.server.v1_7_R1.ServerConnection.c(ServerConnection.java:77)
28.03 04:43:50 [Server] WARN at net.minecraft.server.v1_7_R1.NetworkManager.a(NetworkManager.java:150)
28.03 04:43:50 [Server] WARN at net.minecraft.server.v1_7_R1.LoginListener.a(LoginListener.java:42)
28.03 04:43:50 [Server] WARN at net.minecraft.server.v1_7_R1.LoginListener.c(LoginListener.java:87)
28.03 04:43:50 [Server] WARN at net.minecraft.server.v1_7_R1.PlayerList.a(PlayerList.java:135)
28.03 04:43:50 [Server] WARN at net.minecraft.server.v1_7_R1.PlayerList.c(PlayerList.java:245)
28.03 04:43:50 [Server] WARN at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:472)
28.03 04:43:50 [Server] WARN at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:487)
28.03 04:43:50 [Server] WARN at org.bukkit.plugin.TimedRegisteredListener.callEvent(TimedRegisteredListener.java:30)
28.03 04:43:50 [Server] WARN at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
28.03 04:43:50 [Server] WARN at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:318)
28.03 04:43:50 [Server] WARN at java.lang.reflect.Method.invoke(Method.java:606)
28.03 04:43:50 [Server] WARN at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
28.03 04:43:50 [Server] WARN at sun.reflect.GeneratedMethodAccessor356.invoke(Unknown Source)
28.03 04:43:50 [Server] WARN at com.turt2live.antishare.ASListener.onJoin(ASListener.java:1746)
28.03 04:43:50 [Server] WARN at com.turt2live.antishare.manager.InventoryManager.loadPlayer(InventoryManager.java:413)
28.03 04:43:50 [Server] WARN at com.turt2live.antishare.inventory.ASInventory.getAll(ASInventory.java:329)
28.03 04:43:50 [Server] WARN at com.turt2live.antishare.inventory.ASInventory.load(ASInventory.java:293)
28.03 04:43:50 [Server] WARN at org.bukkit.configuration.file.FileConfiguration.load(FileConfiguration.java:114)
28.03 04:43:50 [Server] WARN at org.bukkit.configuration.file.FileConfiguration.load(FileConfiguration.java:149)
28.03 04:43:50 [Server] WARN at com.dumptruckman.bukkit.configuration.json.JsonConfiguration.loadFromString(JsonConfiguration.java:148)
28.03 04:43:50 [Server] WARN org.bukkit.configuration.InvalidConfigurationException: Invalid JSON detected.

This looks like a corrupted inventory file. Is it possible to get that player's inventory file (from AntiShare)?

New inventory format coming in the next update. Closing this for now.

If you have the file(s) that produce this error, please let me know.