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java.util.ConcurrentModificationException: 	at java.util.LinkedHashMap$LinkedHashIterator.nextEntry(LinkedHashMap.java:390)	at java.util.LinkedHashMap$EntryIterator.next(LinkedHashMap.java:409)	at java.util.LinkedHashMap$EntryIterator.next(LinkedHashMap.java:408)	at org.bukkit.configuration.MemorySection.mapChildrenValues(MemorySection.java:729)	at org.bukkit.configuration.MemorySection.getValues(MemorySection.java:96)	at ru.tehkode.permissions.backends.file.FileEntity.getNode(FileEntity.java:58)	at ru.tehkode.permissions.backends.file.FileEntity.(FileEntity.java:42)	at ru.tehkode.permissions.backends.file.FileUser.(FileUser.java:39)	at ru.tehkode.permissions.backends.FileBackend.getUser(FileBackend.java:111)	at ru.tehkode.permissions.PermissionManager.getUser(PermissionManager.java:116)	at ru.tehkode.permissions.PermissionManager.getUser(PermissionManager.java:135)	at ru.tehkode.permissions.bukkit.PermissionsEx.getUser(PermissionsEx.java:201)	at ru.tehkode.permissions.bukkit.superperms.PermissiblePEX.checkPermission(PermissiblePEX.java:135)	at ru.tehkode.permissions.bukkit.superperms.PermissiblePEX.hasPermission(PermissiblePEX.java:116)	at org.bukkit.craftbukkit.v1_5_R3.entity.CraftHumanEntity.hasPermission(CraftHumanEntity.java:111)	at me.jne.AntiAd.Adfinder.checkForAdvertising(Adfinder.java:132)	at me.jne.AntiAd.Adfinder.check(Adfinder.java:52)	at me.jne.AntiAd.ADListener.onPlayerChat(ADListener.java:27)	at sun.reflect.GeneratedMethodAccessor240.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:601)	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:426)	at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)	at org.bukkit.plugin.TimedRegisteredListener.callEvent(TimedRegisteredListener.java:31)	at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:478)	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:460)	at net.minecraft.server.v1_5_R3.PlayerConnection.chat(PlayerConnection.java:895)	at net.minecraft.server.v1_5_R3.PlayerConnection.a(PlayerConnection.java:846)	at net.minecraft.server.v1_5_R3.Packet3Chat.handle(Packet3Chat.java:44)	at org.spigotmc.netty.NettyNetworkManager$2.run(NettyNetworkManager.java:130)	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)	at java.util.concurrent.FutureTask.run(FutureTask.java:166)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)	at java.lang.Thread.run(Thread.java:722)