Error when i trying follow entity

Error log

[20:45:00] [Client thread/INFO] [net.minecraft.client.gui.GuiNewChat]: [CHAT] [Baritone] > follow entity enderman [20:45:00] [Client thread/INFO] [net.minecraft.client.gui.GuiNewChat]: [CHAT] [Baritone] An unhandled exception occurred.The error is in your game's log, please report this at https://github.com/cabaletta/baritone/issues [20:45:00] [Client thread/INFO] [STDERR]: [baritone.api.command.exception.CommandUnhandledException:handle:-1]: baritone.api.command.exception.CommandUnhandledException: java.lang.NoSuchFieldError: field_191308_b [20:45:00] [Client thread/INFO] [STDERR]: [baritone.api.command.exception.CommandUnhandledException:handle:-1]: at baritone.cc.execute(Unknown Source) [20:45:00] [Client thread/INFO] [STDERR]: [baritone.api.command.exception.CommandUnhandledException:handle:-1]: at baritone.x.a(Unknown Source) [20:45:00] [Client thread/INFO] [STDERR]: [baritone.api.command.exception.CommandUnhandledException:handle:-1]: at baritone.x.onSendChatMessage(Unknown Source) [20:45:00] [Client thread/INFO] [STDERR]: [baritone.api.command.exception.CommandUnhandledException:handle:-1]: at baritone.ce.a(Unknown Source) [20:45:00] [Client thread/INFO] [STDERR]: [baritone.api.command.exception.CommandUnhandledException:handle:-1]: at baritone.ce$$Lambda$881/1452293471.accept(Unknown Source) [20:45:00] [Client thread/INFO] [STDERR]: [baritone.api.command.exception.CommandUnhandledException:handle:-1]: at java.util.concurrent.CopyOnWriteArrayList.forEach(CopyOnWriteArrayList.java:890) [20:45:00] [Client thread/INFO] [STDERR]: [baritone.api.command.exception.CommandUnhandledException:handle:-1]: at baritone.ce.onSendChatMessage(Unknown Source) [20:45:00] [Client thread/INFO] [STDERR]: [baritone.api.command.exception.CommandUnhandledException:handle:-1]: at net.minecraft.client.entity.EntityPlayerSP.handler$sendChatMessage$zeg000(EntityPlayerSP.java) [20:45:00] [Client thread/INFO] [STDERR]: [baritone.api.command.exception.CommandUnhandledException:handle:-1]: at net.minecraft.client.entity.EntityPlayerSP.func_71165_d(EntityPlayerSP.java) [20:45:00] [Client thread/INFO] [STDERR]: [baritone.api.command.exception.CommandUnhandledException:handle:-1]: at net.minecraft.client.gui.GuiScreen.func_175281_b(GuiScreen.java:424) [20:45:00] [Client thread/INFO] [STDERR]: [baritone.api.command.exception.CommandUnhandledException:handle:-1]: at net.minecraft.client.gui.GuiScreen.func_175275_f(GuiScreen.java:411) [20:45:00] [Client thread/INFO] [STDERR]: [baritone.api.command.exception.CommandUnhandledException:handle:-1]: at net.minecraft.client.gui.GuiChat.func_73869_a(SourceFile:81) [20:45:00] [Client thread/INFO] [STDERR]: [baritone.api.command.exception.CommandUnhandledException:handle:-1]: at net.minecraft.client.gui.GuiScreen.func_146282_l(GuiScreen.java:558) [20:45:00] [Client thread/INFO] [STDERR]: [baritone.api.command.exception.CommandUnhandledException:handle:-1]: at net.minecraft.client.gui.GuiScreen.func_146269_k(GuiScreen.java:512) [20:45:00] [Client thread/INFO] [STDERR]: [baritone.api.command.exception.CommandUnhandledException:handle:-1]: at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1759) [20:45:00] [Client thread/INFO] [STDERR]: [baritone.api.command.exception.CommandUnhandledException:handle:-1]: at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:1098) [20:45:00] [Client thread/INFO] [STDERR]: [baritone.api.command.exception.CommandUnhandledException:handle:-1]: at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:398) [20:45:00] [Client thread/INFO] [STDERR]: [baritone.api.command.exception.CommandUnhandledException:handle:-1]: at net.minecraft.client.main.Main.main(SourceFile:123) [20:45:00] [Client thread/INFO] [STDERR]: [baritone.api.command.exception.CommandUnhandledException:handle:-1]: at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [20:45:00] [Client thread/INFO] [STDERR]: [baritone.api.command.exception.CommandUnhandledException:handle:-1]: at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) [20:45:00] [Client thread/INFO] [STDERR]: [baritone.api.command.exception.CommandUnhandledException:handle:-1]: at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) [20:45:00] [Client thread/INFO] [STDERR]: [baritone.api.command.exception.CommandUnhandledException:handle:-1]: at java.lang.reflect.Method.invoke(Method.java:497) [20:45:00] [Client thread/INFO] [STDERR]: [baritone.api.command.exception.CommandUnhandledException:handle:-1]: at net.minecraft.launchwrapper.Launch.launch(Launch.java:135) [20:45:00] [Client thread/INFO] [STDERR]: [baritone.api.command.exception.CommandUnhandledException:handle:-1]: at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [20:45:00] [Client thread/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:634]: Caused by: java.lang.NoSuchFieldError: field_191308_b [20:45:00] [Client thread/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:634]: at baritone.api.command.datatypes.EntityClassById.get(Unknown Source) [20:45:00] [Client thread/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:634]: at baritone.api.command.datatypes.EntityClassById.get(Unknown Source) [20:45:00] [Client thread/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:634]: at baritone.ag.getDatatypeFor(Unknown Source) [20:45:00] [Client thread/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:634]: at baritone.aw.execute(Unknown Source) [20:45:00] [Client thread/INFO] [STDERR]: [java.lang.Throwable:printStackTrace:634]: ... 24 more

That means there are no enderman in loaded chunks.

Replicated the error with enderman behind the wall

Yea looking at the log, this seems like an actual error (Maybe the wrong file being loaded since its a mapping issue)

Can confirm: follow entity sheep with the sheep right next to me caused this error. I am running with forge too.

Ill try to reproduce this today possibly...

The issue is definitely with forge, it seems that one of its patches removes the field in question: https://github.com/MinecraftForge/MinecraftForge/blob/1.12.x/patches/minecraft/net/minecraft/entity/EntityList.java.patch#L7

I also accidentally found the following in my log file coming from WorldDownloader, it seems like they struggled with the same issue:

[20:34:31] [World Downloader update check thread/INFO]: [WDL] NoSuchFieldException due to forge; switching to fallback. This is (sadly) expected: 
java.lang.NoSuchFieldError: field_191308_b
	at wdl.StandardEntityManagers.<clinit>(StandardEntityManagers_1_12.java:383) [StandardEntityManagers.class:?]
	at wdl.EntityUtils.<clinit>(EntityUtils.java:48) [EntityUtils.class:?]
	at java.lang.Class.forName0(Native Method) ~[?:1.8.0_265]
	at java.lang.Class.forName(Class.java:264) [?:1.8.0_265]
	at wdl.update.ClassHasher.hash(ClassHasher.java:57) [ClassHasher.class:?]
	at wdl.update.WDLUpdateChecker.run(WDLUpdateChecker.java:316) [WDLUpdateChecker.class:?]

See Pokechu22/WorldDownloader@624380b

This bug appears only on the forge version of the game