[11:49:37] [Server thread/FATAL] [net.minecraft.server.MinecraftServer]: Error executing task
java.util.concurrent.ExecutionException: java.lang.NoClassDefFoundError: net/minecraft/client/entity/EntityPlayerSP
at java.util.concurrent.FutureTask.report(Unknown Source) ~[?:1.8.0_211]
at java.util.concurrent.FutureTask.get(Unknown Source) ~[?:1.8.0_211]
at net.minecraft.util.Util.func_181617_a(SourceFile:47) [h.class:?]
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:723) [MinecraftServer.class:?]
at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:397) [nz.class:?]
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:668) [MinecraftServer.class:?]
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:526) [MinecraftServer.class:?]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_211]
Caused by: java.lang.NoClassDefFoundError: net/minecraft/client/entity/EntityPlayerSP
at net.shadowmage.ancientwarfare.npc.item.ItemRoutingOrder.onKeyAction(ItemRoutingOrder.java:47) ~[ItemRoutingOrder.class:?]
at net.shadowmage.ancientwarfare.core.network.PacketItemInteraction.executeKeyPress(PacketItemInteraction.java:48) ~[PacketItemInteraction.class:?]
at net.shadowmage.ancientwarfare.core.network.PacketItemInteraction.execute(PacketItemInteraction.java:36) ~[PacketItemInteraction.class:?]
at net.shadowmage.ancientwarfare.core.network.PacketHandlerServer.lambda$onServerPacket$0(PacketHandlerServer.java:21) ~[PacketHandlerServer.class:?]
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) ~[?:1.8.0_211]
at java.util.concurrent.FutureTask.run(Unknown Source) ~[?:1.8.0_211]
at net.minecraft.util.Util.func_181617_a(SourceFile:46) ~[h.class:?]
... 5 more
Caused by: java.lang.ClassNotFoundException: net.minecraft.client.entity.EntityPlayerSP
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:101) ~[launchwrapper-1.12.jar:?]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_211]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_211]
at net.shadowmage.ancientwarfare.npc.item.ItemRoutingOrder.onKeyAction(ItemRoutingOrder.java:47) ~[ItemRoutingOrder.class:?]
at net.shadowmage.ancientwarfare.core.network.PacketItemInteraction.executeKeyPress(PacketItemInteraction.java:48) ~[PacketItemInteraction.class:?]
at net.shadowmage.ancientwarfare.core.network.PacketItemInteraction.execute(PacketItemInteraction.java:36) ~[PacketItemInteraction.class:?]
at net.shadowmage.ancientwarfare.core.network.PacketHandlerServer.lambda$onServerPacket$0(PacketHandlerServer.java:21) ~[PacketHandlerServer.class:?]
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) ~[?:1.8.0_211]
at java.util.concurrent.FutureTask.run(Unknown Source) ~[?:1.8.0_211]
at net.minecraft.util.Util.func_181617_a(SourceFile:46) ~[h.class:?]
... 5 more

Hi, can we get the full crash report? Is this an old world you loaded up into the new version? If so, is it an old routing order from before the new version?

Is this on a server?
If so, you have the exact same AW version in both client and server side?

yes on a server and same version

I have the same problem with the latest version of ancientwarfare-1.12.2-2.7.0.668 and forge 1.12.2_14.23.5.2836

btw its not a crash this item just dont work in Multiplayer, here is my error log :

[01:07:38] [Server thread/FATAL] [minecraft/MinecraftServer]: Error executing task
java.util.concurrent.ExecutionException: java.lang.NoClassDefFoundError: net/minecraft/client/entity/EntityPlayerSP
at java.util.concurrent.FutureTask.report(Unknown Source) ~[?:1.8.0_181]
at java.util.concurrent.FutureTask.get(Unknown Source) ~[?:1.8.0_181]
at net.minecraft.util.Util.func_181617_a(SourceFile:47) [h.class:?]
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:723) [MinecraftServer.class:?]
at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:397) [nz.class:?]
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:668) [MinecraftServer.class:?]
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:526) [MinecraftServer.class:?]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_181]
Caused by: java.lang.NoClassDefFoundError: net/minecraft/client/entity/EntityPlayerSP
at net.shadowmage.ancientwarfare.npc.item.ItemRoutingOrder.onKeyAction(ItemRoutingOrder.java:47) ~[ItemRoutingOrder.class:?]
at net.shadowmage.ancientwarfare.core.network.PacketItemInteraction.executeKeyPress(PacketItemInteraction.java:48) ~[PacketItemInteraction.class:?]
at net.shadowmage.ancientwarfare.core.network.PacketItemInteraction.execute(PacketItemInteraction.java:36) ~[PacketItemInteraction.class:?]
at net.shadowmage.ancientwarfare.core.network.PacketHandlerServer.lambda$onServerPacket$0(PacketHandlerServer.java:21) ~[PacketHandlerServer.class:?]
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) ~[?:1.8.0_181]
at java.util.concurrent.FutureTask.run(Unknown Source) ~[?:1.8.0_181]
at net.minecraft.util.Util.func_181617_a(SourceFile:46) ~[h.class:?]
... 5 more
Caused by: java.lang.ClassNotFoundException: net.minecraft.client.entity.EntityPlayerSP
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:101) ~[launchwrapper-1.12.jar:?]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_181]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_181]
at net.shadowmage.ancientwarfare.npc.item.ItemRoutingOrder.onKeyAction(ItemRoutingOrder.java:47) ~[ItemRoutingOrder.class:?]
at net.shadowmage.ancientwarfare.core.network.PacketItemInteraction.executeKeyPress(PacketItemInteraction.java:48) ~[PacketItemInteraction.class:?]
at net.shadowmage.ancientwarfare.core.network.PacketItemInteraction.execute(PacketItemInteraction.java:36) ~[PacketItemInteraction.class:?]
at net.shadowmage.ancientwarfare.core.network.PacketHandlerServer.lambda$onServerPacket$0(PacketHandlerServer.java:21) ~[PacketHandlerServer.class:?]
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) ~[?:1.8.0_181]
at java.util.concurrent.FutureTask.run(Unknown Source) ~[?:1.8.0_181]
at net.minecraft.util.Util.func_181617_a(SourceFile:46) ~[h.class:?]
... 5 more

crash-2019-05-22_12.10.00-client.txt

Guess it is the same problem as the topic
On a server, both client and server are 668 build
forge-1.12.2-14.23.5.2836-universal