channel

java.util.concurrent.ExecutionException: java.lang.IllegalStateException: Too many channels registered
        at java.util.concurrent.FutureTask.report(FutureTask.java:122) ~[?:1.8.0_112]
        at java.util.concurrent.FutureTask.get(FutureTask.java:192) ~[?:1.8.0_112]
        at net.minecraft.server.v1_10_R1.SystemUtils.a(SourceFile:46) [spigot.jar:git-Spigot-de459a2-51263e9]
        at net.minecraft.server.v1_10_R1.MinecraftServer.D(MinecraftServer.java:732) [spigot.jar:git-Spigot-de459a2-51263e9]
        at net.minecraft.server.v1_10_R1.DedicatedServer.D(DedicatedServer.java:400) [spigot.jar:git-Spigot-de459a2-51263e9]
        at net.minecraft.server.v1_10_R1.MinecraftServer.C(MinecraftServer.java:668) [spigot.jar:git-Spigot-de459a2-51263e9]
        at net.minecraft.server.v1_10_R1.MinecraftServer.run(MinecraftServer.java:567) [spigot.jar:git-Spigot-de459a2-51263e9]
        at java.lang.Thread.run(Thread.java:745) [?:1.8.0_112]
Caused by: java.lang.IllegalStateException: Too many channels registered
        at com.google.common.base.Preconditions.checkState(Preconditions.java:176) ~[spigot.jar:git-Spigot-de459a2-51263e9]
        at org.bukkit.craftbukkit.v1_10_R1.entity.CraftPlayer.addChannel(CraftPlayer.java:1076) ~[spigot.jar:git-Spigot-de459a2-51263e9]
        at net.minecraft.server.v1_10_R1.PlayerConnection.a(PlayerConnection.java:2504) ~[spigot.jar:git-Spigot-de459a2-51263e9]
        at net.minecraft.server.v1_10_R1.PacketPlayInCustomPayload.a(SourceFile:58) ~[spigot.jar:git-Spigot-de459a2-51263e9]
        at net.minecraft.server.v1_10_R1.PacketPlayInCustomPayload.a(SourceFile:8) ~[spigot.jar:git-Spigot-de459a2-51263e9]
        at net.minecraft.server.v1_10_R1.PlayerConnectionUtils$1.run(SourceFile:13) ~[spigot.jar:git-Spigot-de459a2-51263e9]
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[?:1.8.0_112]
        at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_112]
        at net.minecraft.server.v1_10_R1.SystemUtils.a(SourceFile:45) ~[spigot.jar:git-Spigot-de459a2-51263e9]
        ... 5 more