Sorry if an old thread answered this. I did take a look at them but there was a lot of back and forth and it wasn't very clear what the resolution was.

On start I get a mixin error
[main/ERROR] [mixin]: Mixin config mixins.forgeessentials.json does not specify "minVersion" property

Then shorty after I get these.
[09:22:43] [main/ERROR] [mixin]: Classloader restrictions [PACKAGE_CLASSLOADER_EXCLUSION] encountered loading mixins.forgeessentials.json:block.MixinBlockPortal, name: com.forgeessentials.core.preloader.mixin.block.MixinBlockPortal
[09:22:43] [main/ERROR] [mixin]: Classloader restrictions [PACKAGE_CLASSLOADER_EXCLUSION] encountered loading mixins.forgeessentials.json:block.MixinBlockFire, name: com.forgeessentials.core.preloader.mixin.block.MixinBlockFire
[09:22:43] [main/ERROR] [mixin]: Classloader restrictions [PACKAGE_CLASSLOADER_EXCLUSION] encountered loading mixins.forgeessentials.json:block.MixinBlockEndPortal, name: com.forgeessentials.core.preloader.mixin.block.MixinBlockEndPortal
[09:22:43] [main/ERROR] [mixin]: Classloader restrictions [PACKAGE_CLASSLOADER_EXCLUSION] encountered loading mixins.forgeessentials.json:command.MixinCommandHandler, name: com.forgeessentials.core.preloader.mixin.command.MixinCommandHandler
[09:22:43] [main/ERROR] [mixin]: Classloader restrictions [PACKAGE_CLASSLOADER_EXCLUSION] encountered loading mixins.forgeessentials.json:entity.MixinEntity, name: com.forgeessentials.core.preloader.mixin.entity.MixinEntity
[09:22:43] [main/ERROR] [mixin]: Classloader restrictions [PACKAGE_CLASSLOADER_EXCLUSION] encountered loading mixins.forgeessentials.json:entity.player.MixinEntityPlayer, name: com.forgeessentials.core.preloader.mixin.entity.player.MixinEntityPlayer
[09:22:43] [main/ERROR] [mixin]: Classloader restrictions [PACKAGE_CLASSLOADER_EXCLUSION] encountered loading mixins.forgeessentials.json:item.crafting.MixinCraftingManager, name: com.forgeessentials.core.preloader.mixin.item.crafting.MixinCraftingManager
[09:22:43] [main/ERROR] [mixin]: Classloader restrictions [PACKAGE_CLASSLOADER_EXCLUSION] encountered loading mixins.forgeessentials.json:network.MixinNetHandlerPlayServer, name: com.forgeessentials.core.preloader.mixin.network.MixinNetHandlerPlayServer
[09:22:43] [main/ERROR] [mixin]: Classloader restrictions [PACKAGE_CLASSLOADER_EXCLUSION] encountered loading mixins.forgeessentials.json:MixinDimensionManager, name: com.forgeessentials.core.preloader.mixin.MixinDimensionManager

Then the server starts. Now the server runs without any issues I was just wondering if there was any way to clean up these errors. I've tried googling it and looking through older tickets but I really can't find a solutions. I know I probably have to set the mixin version but I am unclear where I do that. Thank you in advanced. Oh and I do have the latest FE build as of June 25.

In summery:

• FE server is not supposed nor supported on the MC client.
• The registered twice notification is annoying but isn't an issue
• Since this post is made, there have been new releases of FE containing mixing updates on Jenkins that invalidates this issue.

Therefor I'll be closing this issue. If you still encounter mixin loading errors with build 76 as of now, please be welcome to use the correct new issue form to report a bug.

I've got the same problem, the latest log file. just forge essentials and client running on internal Minecraft Server. Both downloaded from CurseForge yesterday.

--- ModList ---

Generated: 12-1-2020 (Server time)

Build: 54

Change the location of this file in main.cfg

Minecraft;1.12.2;minecraft.jar;
Minecraft Coder Pack;9.42;minecraft.jar;http://www.modcoderpack.com/website/
Forge Mod Loader;8.0.99.99;forge-1.12.2-14.23.5.2846-universal.jar;https://github.com/MinecraftForge/FML/wiki
Minecraft Forge;14.23.5.2846;forge-1.12.2-14.23.5.2846-universal.jar;http://minecraftforge.net
ForgeEssentials Client Addon;12.3;forgeessentials-1.12.2-12.3.54-client.jar;
Forge Essentials;12.3;forgeessentials-1.12.2-12.3.73-server.jar;

Also outside of mixin I get these errors once the server is fully loaded.

[09:26:50] [Server thread/ERROR] [forgeessentials]: Command gamemode registered twice
[09:26:50] [Server thread/ERROR] [forgeessentials]: Command worldborder registered twice
[09:26:50] [Server thread/ERROR] [forgeessentials]: Command alias butcher of command febutcher registered twice
[09:26:50] [Server thread/ERROR] [forgeessentials]: Command alias kill of command fekill registered twice
[09:26:50] [Server thread/ERROR] [forgeessentials]: Command alias weather of command feweather registered twice
[09:26:50] [Server thread/ERROR] [forgeessentials]: Command help registered twice
[09:26:50] [Server thread/ERROR] [forgeessentials]: Command alias ? of command help registered twice
[09:26:50] [Server thread/ERROR] [forgeessentials]: Command alias tm of command timedmessage registered twice
[09:26:50] [Server thread/ERROR] [forgeessentials]: Command alias reload of command fereload registered twice
[09:26:50] [Server thread/ERROR] [forgeessentials]: Command alias remove of command feremove registered twice
[09:26:50] [Server thread/ERROR] [forgeessentials]: Command alias biomeinfo of command febiome registered twice
[09:26:50] [Server thread/ERROR] [forgeessentials]: Command alias locate of command felocate registered twice
[09:26:50] [Server thread/ERROR] [forgeessentials]: Command alias enchant of command feenchant registered twice
[09:26:50] [Server thread/ERROR] [forgeessentials]: Command time registered twice

Not really sure why either. Maybe it has to do with the mods I have, but if anything I can open another ticket up for these specifically.

Anything on this ticket?