Help with HashMap

Hello guys, I have code a plugin for antiafk, it work but the run give me a error:

[ControlFeature] Task #8753 for ControlFeature v0.1 generated an exception
java.util.ConcurrentModificationException
at java.util.HashMap$HashIterator.remove(HashMap.java:1451) ~[?:1.8.0_121]
at me.phond.control.Main$2.run(Main.java:224) ~[?:?]
at org.bukkit.craftbukkit.v1_7_R4.scheduler.CraftTask.run(CraftTask.java:71) ~[spigot.jar:git-PaperSpigot-1f7d532]
at org.bukkit.craftbukkit.v1_7_R4.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:350) [spigot.jar:git-PaperSpigot-1f7d532]
at net.minecraft.server.v1_7_R4.MinecraftServer.v(MinecraftServer.java:701) [spigot.jar:git-PaperSpigot-1f7d532]
at net.minecraft.server.v1_7_R4.DedicatedServer.v(DedicatedServer.java:307) [spigot.jar:git-PaperSpigot-1f7d532]
at net.minecraft.server.v1_7_R4.MinecraftServer.u(MinecraftServer.java:643) [spigot.jar:git-PaperSpigot-1f7d532]
at net.minecraft.server.v1_7_R4.MinecraftServer.run(MinecraftServer.java:549) [spigot.jar:git-PaperSpigot-1f7d532]
at net.minecraft.server.v1_7_R4.ThreadServerApplication.run(SourceFile:628) [spigot.jar:git-PaperSpigot-1f7d532]

This is the source:
https://pastebin.com/yU9JKPRF

Help me plis guys

 

I'm unable to help you. I don't know on which line the error appears, you only gave a little piece of your code.
Please mark line 224 in your main class.

 

You can't remove elements from a collection while looping over it.
Loop over a cloned version of the collection

To clone do new HashMap<>(yourHashmap)

 

@Lusberd Use iterator for remove while looping