Example of techguns error in console

[22:45:55] [Server thread/FATAL]: Error executing task 
java.util.concurrent.ExecutionException: java.lang.ClassCastException: techguns.entities.npcs.PsychoSteve cannot be cast to net.minecraft.entity.player.EntityPlayerMP 
at java.util.concurrent.FutureTask.report(FutureTask.java:122) ~[?:1.8.0_151] 
at java.util.concurrent.FutureTask.get(FutureTask.java:192) ~[?:1.8.0_151] 
at net.minecraft.util.Util.func_181617_a(SourceFile:47) [h.class:?] 
at org.spongepowered.common.SpongeImplHooks.onUtilRunTask(SpongeImplHooks.java:275) [SpongeImplHooks.class:1.12.2-2586-7.1.0-BETA-2887] 
at net.minecraft.server.MinecraftServer.redirect$onRun$zje000(MinecraftServer.java:4003) [MinecraftServer.class:?] 
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:721) [MinecraftServer.class:?] 
at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:396) [nz.class:?] 
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:666) [MinecraftServer.class:?] 
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:524) [MinecraftServer.class:?] 
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_151] 
Caused by: java.lang.ClassCastException: techguns.entities.npcs.PsychoSteve cannot be cast to net.minecraft.entity.player.EntityPlayerMP 
at techguns.items.armors.GenericArmor.damageArmor(GenericArmor.java:469) ~[GenericArmor.class:?] 
at org.spongepowered.mod.util.StaticMixinForgeHelper.acceptArmorModifier(StaticMixinForgeHelper.java:137) ~[StaticMixinForgeHelper.class:1.12.2-2586-7.1.0-BETA-2887] 
at net.minecraft.entity.EntityLivingBase.applyArmorDamage(EntityLivingBase.java:5565) ~[vp.class:?] 
at net.minecraft.entity.EntityLivingBase.damageEntityHook(EntityLivingBase.java:3652) ~[vp.class:?] 
at net.minecraft.entity.EntityLivingBase.func_70097_a(EntityLivingBase.java:3454) ~[vp.class:?] 
at net.minecraft.entity.monster.EntityMob.func_70097_a(EntityMob.java:70) ~[ade.class:?] 
at net.minecraft.entity.player.EntityPlayer.func_71059_n(EntityPlayer.java:3915) ~[aed.class:?] 
at net.minecraft.entity.player.EntityPlayerMP.func_71059_n(EntityPlayerMP.java:1420) ~[oq.class:?] 
at net.minecraft.network.NetHandlerPlayServer.func_147340_a(NetHandlerPlayServer.java:2589) ~[pa.class:?] 
at net.minecraft.network.play.client.CPacketUseEntity.func_148833_a(SourceFile:69) ~[li.class:?] 
at net.minecraft.network.play.client.CPacketUseEntity.func_148833_a(SourceFile:13) ~[li.class:?] 
at org.spongepowered.common.network.PacketUtil.onProcessPacket(PacketUtil.java:149) ~[PacketUtil.class:1.12.2-2586-7.1.0-BETA-2887] 
at net.minecraft.network.PacketThreadUtil$1.redirect$onProcessPacket$zkp000(SourceFile:539) ~[hv$1.class:?] 
at net.minecraft.network.PacketThreadUtil$1.run(SourceFile:13) ~[hv$1.class:?] 
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[?:1.8.0_151] 
at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_151] 
at net.minecraft.util.Util.func_181617_a(SourceFile:46) ~[h.class:?] 
... 7 more