Searched on Google with the first line of a JAVA stack trace?

We can recommend more relevant solutions and speed up debugging when you paste your entire stack trace with the exception message. Try a sample exception.

Recommended solutions based on your search

Solutions on the web

net.minecraft.server.v1_11_R1.ReportedException: Ticking player at net.minecraft.server.v1_11_R1.EntityPlayer.playerTick(EntityPlayer.java:366)[patched_1.11.2.jar:git-Paper-1020] at net.minecraft.server.v1_11_R1.PlayerConnection.F_(PlayerConnection.java:139)[patched_1.11.2.jar:git-Paper-1020] at net.minecraft.server.v1_11_R1.NetworkManager.a(NetworkManager.java:239)[patched_1.11.2.jar:git-Paper-1020] at net.minecraft.server.v1_11_R1.ServerConnection.c(ServerConnection.java:150)[patched_1.11.2.jar:git-Paper-1020] at net.minecraft.server.v1_11_R1.MinecraftServer.D(MinecraftServer.java:916)[patched_1.11.2.jar:git-Paper-1020] at net.minecraft.server.v1_11_R1.DedicatedServer.D(DedicatedServer.java:403)[patched_1.11.2.jar:git-Paper-1020] at net.minecraft.server.v1_11_R1.MinecraftServer.C(MinecraftServer.java:749)[patched_1.11.2.jar:git-Paper-1020] at net.minecraft.server.v1_11_R1.MinecraftServer.run(MinecraftServer.java:648)[patched_1.11.2.jar:git-Paper-1020] at java.lang.Thread.run(Thread.java:745)[?:1.8.0_91]Caused by: java.util.ConcurrentModificationException at java.util.HashMap$HashIterator.nextNode(HashMap.java:1429)[?:1.8.0_91] at java.util.HashMap$KeyIterator.next(HashMap.java:1453)[?:1.8.0_91] at net.minecraft.server.v1_11_R1.NBTTagCompound.g(NBTTagCompound.java:358)[patched_1.11.2.jar:git-Paper-1020] at net.minecraft.server.v1_11_R1.NBTTagCompound.clone(NBTTagCompound.java:435)[patched_1.11.2.jar:git-Paper-1020] at net.minecraft.server.v1_11_R1.NBTTagCompound.g(NBTTagCompound.java:360)[patched_1.11.2.jar:git-Paper-1020] at net.minecraft.server.v1_11_R1.ItemStack.cloneItemStack(ItemStack.java:468)[patched_1.11.2.jar:git-Paper-1020] at net.minecraft.server.v1_11_R1.PacketPlayOutEntityEquipment.<init>(SourceFile:21)[patched_1.11.2.jar:git-Paper-1020] at net.minecraft.server.v1_11_R1.EntityLiving.A_(EntityLiving.java:1882)[patched_1.11.2.jar:git-Paper-1020] at net.minecraft.server.v1_11_R1.EntityHuman.A_(EntityHuman.java:143)[patched_1.11.2.jar:git-Paper-1020] at net.minecraft.server.v1_11_R1.EntityPlayer.playerTick(EntityPlayer.java:285)[patched_1.11.2.jar:git-Paper-1020] ... 8 more