Konsola :(

cały czas są błędy w konsoli, proszę o pomoc bo to chyba powoduje lagi

[18:30:28] [Server thread/WARN]: [ChestCommands] Task #32 for ChestCommands v3.1.1 generated an exception java.lang.NoSuchMethodError: org.bukkit.Bukkit.getOnlinePlayers()Ljava/util/Collection; at com.gmail.filoghost.chestcommands.task.RefreshMenusTask.run(RefreshMenusTask.java:18) ~[?:?] at org.bukkit.craftbukkit.v1_7_R1.scheduler.CraftTask.run(CraftTask.java:53) ~[craftbukkit-dev-1.7.2-R0.3.jar:git-Bukkit-1.7.2-R0.2-50-gdce2b35-b3019jnks] at org.bukkit.craftbukkit.v1_7_R1.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:345) [craftbukkit-dev-1.7.2-R0.3.jar:git-Bukkit-1.7.2-R0.2-50-gdce2b35-b3019jnks] at net.minecraft.server.v1_7_R1.MinecraftServer.u(MinecraftServer.java:587) [craftbukkit-dev-1.7.2-R0.3.jar:git-Bukkit-1.7.2-R0.2-50-gdce2b35-b3019jnks] at net.minecraft.server.v1_7_R1.DedicatedServer.u(DedicatedServer.java:250) [craftbukkit-dev-1.7.2-R0.3.jar:git-Bukkit-1.7.2-R0.2-50-gdce2b35-b3019jnks] at net.minecraft.server.v1_7_R1.MinecraftServer.t(MinecraftServer.java:545) [craftbukkit-dev-1.7.2-R0.3.jar:git-Bukkit-1.7.2-R0.2-50-gdce2b35-b3019jnks] at net.minecraft.server.v1_7_R1.MinecraftServer.run(MinecraftServer.java:457) [craftbukkit-dev-1.7.2-R0.3.jar:git-Bukkit-1.7.2-R0.2-50-gdce2b35-b3019jnks] at net.minecraft.server.v1_7_R1.ThreadServerApplication.run(SourceFile:617) [craftbukkit-dev-1.7.2-R0.3.jar:git-Bukkit-1.7.2-R0.2-50-gdce2b35-b3019jnks] [18:30:28] [Server thread/WARN]: [ChestCommands] Task #32 for ChestCommands v3.1.1 generated an exception