[06:12:14 WARN]: [hungergames] Task #6 for hungergames v1.0 generated an exception
java.util.ConcurrentModificationException
        at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:859) ~[?:1.7.0_79]
        at java.util.ArrayList$Itr.next(ArrayList.java:831) ~[?:1.7.0_79]
        at sg.main.Main$1.run(Main.java:106) ~[?:?]
        at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftTask.run(CraftTask.java:71) ~[spigot-1.8.6.jar:git-Spigot-6a6b839-b0e81a4]
        at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:350) [spigot-1.8.6.jar:git-Spigot-6a6b839-b0e81a4]
        at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:726) [spigot-1.8.6.jar:git-Spigot-6a6b839-b0e81a4]
        at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:367) [spigot-1.8.6.jar:git-Spigot-6a6b839-b0e81a4]
        at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:657) [spigot-1.8.6.jar:git-Spigot-6a6b839-b0e81a4]
        at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:560) [spigot-1.8.6.jar:git-Spigot-6a6b839-b0e81a4]
        at java.lang.Thread.run(Thread.java:745) [?:1.7.0_79]
[06:12:20 WARN]: [hungergames] Task #8 for hungergames v1.0 generated an exception
java.util.ConcurrentModificationException
        at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:859) ~[?:1.7.0_79]
        at java.util.ArrayList$Itr.next(ArrayList.java:831) ~[?:1.7.0_79]
        at sg.main.Main$2.run(Main.java:126) ~[?:?]
        at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftTask.run(CraftTask.java:71) ~[spigot-1.8.6.jar:git-Spigot-6a6b839-b0e81a4]
        at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:350) [spigot-1.8.6.jar:git-Spigot-6a6b839-b0e81a4]
        at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:726) [spigot-1.8.6.jar:git-Spigot-6a6b839-b0e81a4]
        at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:367) [spigot-1.8.6.jar:git-Spigot-6a6b839-b0e81a4]
        at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:657) [spigot-1.8.6.jar:git-Spigot-6a6b839-b0e81a4]
        at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:560) [spigot-1.8.6.jar:git-Spigot-6a6b839-b0e81a4]
        at java.lang.Thread.run(Thread.java:745) [?:1.7.0_79]