Bukkit

after i install NoLagg plugin v1.90.4, shown upthis. and all player will be kicked

[18:12:28] [Thread-30/WARN]: [Server] The main thread failed to respond after 10 seconds
[18:12:28] [Thread-30/WARN]: [Server] What follows is the stack trace of the main thread
[18:12:28] [Thread-30/WARN]: [Server]     at java.lang.Thread.sleep(Native Method)
[18:12:28] [Thread-30/WARN]: [Server]     at net.minecraft.server.v1_7_R1.FileIOThread.a(SourceFile:60)
[18:12:28] [Thread-30/WARN]: [Server]     at net.minecraft.server.v1_7_R1.ServerNBTManager.a(SourceFile:47)
[18:12:28] [Thread-30/WARN]: [Server]     at net.minecraft.server.v1_7_R1.WorldServer.saveLevel(WorldServer.java:914)
[18:12:28] [Thread-30/WARN]: [Server]     at net.minecraft.server.v1_7_R1.MinecraftServer.saveChunks(MinecraftServer.java:360)
[18:12:28] [Thread-30/WARN]: [Server]     at net.minecraft.server.v1_7_R1.MinecraftServer.t(MinecraftServer.java:563)
[18:12:28] [Thread-30/WARN]: [Server]     at net.minecraft.server.v1_7_R1.MinecraftServer.run(MinecraftServer.java:457)
[18:12:28] [Thread-30/WARN]: [Server]     at net.minecraft.server.v1_7_R1.ThreadServerApplication.run(SourceFile:617)
[18:12:40] [Thread-30/WARN]: [Server] The main thread is still stuck, current loop line is:
[18:12:40] [Thread-30/WARN]: [Server]     at net.minecraft.server.v1_7_R1.MinecraftServer.t(MinecraftServer.java:563)