Ugdhar

Then you didn't look hard enough

Did you try looking yourself? ItemArmor would be a good place to start.

public ActionResult<ItemStack> onItemRightClick(Itemstack Stack, World worldIn, EntityPlayer playerIn, EnumHand handIn) { I believe Itemstack should be ItemStack. Not sure if that's specifically the problem, but it certainly can't be helping

1.12.1 was (from what I've read) pretty much a bugfix release, so not a lot was changed. Don't expect it this quick when major releases come around, it can take a few weeks+ depending on how much changes. Just keep working on whatever the last stable version was, and keep checking the download page!

https://app.twitch.tv/download

Make sure all rendering stuff is only being used from your client proxy, dedicated servers do not have those classes, so when it sees them and tries to load them, it will crash.

Post a log of a crash with other mods. And a dedicated server is not aware of any client-side classes (they don't exist), so mods that access them, while they will often work playing single player, since the client and server both exist, if they are put on a dedicated server they will crash it because it cannot load any client related classes. So, even with no other mods, one of these will crash a server.

I'm going to guess MorePlayerModels is a client side mod, remove it from your server and see what happens.

On the line for the diamond_shears, it looks like you have spaces before and after the =, is that doing it?

What version? What is your lang file named?

I believe 1.11.2 is still supported, so there's no harm in using it. I believe they support current version and previous version.

Still a bunch of files in the mods folder that shouldn't be. It also looks like you have the forge installer in there. Honestly, I would completely empty out the mods folder and start over. Do a run with no mods, just forge, make sure it works, then add mods 1 by 1, testing after each one. Also make sure you're adding mods that are for 1.12.

Post the new log

1.7.10 is no longer supported here, you need to update. A moderator will likely lock this thread once it is seen.

Only if the mod authors have updated, you would need to get the updated versions. Make sure you stick to the legit sites for downloading mods, the only one I know myself is curse (twitch), but there may be a few others.

Remove them from the mods folder, %APPDATA%\.minecraft\mods

You have mods for 1.7.2 in there, you need to remove them using 1.12. *edit: It looks like you have mods for 1.11.2 in there as well.

Forge/Minecraft that old is no longer supported here, you need to update. Also, don't download stuff from random sites, there are a few legit channels for minecraft mods, and the rest are either unauthorized reposts or worse.

You're not posting logs, the only thing I could think to suggest without them is start removing mods one by one until it works.

Post the fml-client-latest log

Update, 1.7.10 is no longer supported here, and a mod will likely lock this thread once it's seen. If you're sticking to such an ancient version because of mods that haven't been updated, you should harass the mod author(s) to update.

https://app.twitch.tv/download

@idk.com google for "how to run a jar file" @BenX141 You should really start your own thread instead of hijacking someone else's with a completely different issue. Also, Forge 1.7.10 is no longer supported here, as explained in the EAQ.

Report the issue to the ExtraUtils2 author.

You should probably mention this to the mod authors