[22:26:54] [Server thread/INFO]: maxlehot1234 issued server command: /booscooldowns reload
[22:26:55] [Server thread/WARN]: [boosCooldowns] Task #78986 for boosCooldowns v3.8.6 generated an exception
java.lang.NoSuchMethodError: java.util.concurrent.ConcurrentHashMap.keySet()Ljava/util/concurrent/ConcurrentHashMap$KeySetView;
at cz.boosik.boosCooldown.BoosWarmUpManager.hasWarmUps(BoosWarmUpManager.java:94) ~[?:?]
at cz.boosik.boosCooldown.BoosWarmUpTimer$boosWarmUpRunnable.run(BoosWarmUpTimer.java:61) ~[?:?]
at org.bukkit.craftbukkit.v1_8_R1.scheduler.CraftTask.run(CraftTask.java:71) ~[spigot-1.8-R0.1-SNAPSHOT-latest.jar:git-Spigot-29dbaa7-262c777]
at org.bukkit.craftbukkit.v1_8_R1.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:350) [spigot-1.8-R0.1-SNAPSHOT-latest.jar:git-Spigot-29dbaa7-262c777]
at net.minecraft.server.v1_8_R1.MinecraftServer.z(MinecraftServer.java:694) [spigot-1.8-R0.1-SNAPSHOT-latest.jar:git-Spigot-29dbaa7-262c777]
at net.minecraft.server.v1_8_R1.DedicatedServer.z(DedicatedServer.java:316) [spigot-1.8-R0.1-SNAPSHOT-latest.jar:git-Spigot-29dbaa7-262c777]
at net.minecraft.server.v1_8_R1.MinecraftServer.y(MinecraftServer.java:623) [spigot-1.8-R0.1-SNAPSHOT-latest.jar:git-Spigot-29dbaa7-262c777]
at net.minecraft.server.v1_8_R1.MinecraftServer.run(MinecraftServer.java:526) [spigot-1.8-R0.1-SNAPSHOT-latest.jar:git-Spigot-29dbaa7-262c777]
at java.lang.Thread.run(Thread.java:722) [?:1.7.0_03]