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the commands are: !mcp -c moj <name> -> convert from mcp mappings to mojang mappings !moj -c mcp <name> -> convert from mojang mappings to mcp mappings replace '<name>' in your case with 'getHorizontalIndex'

I am currently using 1.17.1 - 37.0.33. I built three different Wither Skeleton farms of different designs and could not get a single skeleton to spawn. So I wandered around half a dozen different Nether Fortresses and found not a single mob spawning, with the exception of Blazes but only from spawners. I never saw more that two Blaze spawn at the same time and anecdotally, the spawn rate seemed a bit slow. Mobs spawned in the biomes outside of the fortress' bounding box, but nothing spawned in the fortresses themselves. There were Striders and Magma Cubes in lava below the fortresses, but I am not certain if they spawned there or moved there. I came across a couple of Bastions in my travels and found Piglins and Piglin Brutes where they should be. My first step in troubleshooting was to load the Vanilla 1.17.1 installation and almost immediately had Wither Skeletons falling into the kill chamber of my last farm build. I had Xaero's Minimap and Xaero's World Map mods loaded originally and removed them as I continued troubleshooting. When I loaded my game up with only the Forge 1.17.1-forge-37.0.33 installation, no more Wither Skeletons. So I never tried either of those mods out by themselves loaded with Forge as the problem seemed to be with Forge itself. Finally, according to this post by @Amun_Fortex they are seeing the same problem but also with Guardians. I have not yet bothered with an Ocean Monument in 1.17.1, but will find one and update if I am seeing the same issue. Also, the http://vazkii.us/br101/ link in the Rules and EAQ is broken, returning a 404 error.

use EntityRenderersEvent.RegisterRenderers

Hello Just like a few other people I get the Error Code: 0 crash when trying to launch the game with the forge profile with mods. Specifically the OptiFine (extracted Mod-version). Running Forge without it works. Running the separate OptiFine (not extracted mod-)version without Forge works as well. But together makes it crash a second after I click the Launch button without the red loading screen. Here an overview on what I have and tried: I'm running the latest Forge version. OptiFine is also the latest, matching version. Java is up to date as well. There are no other mods, shaders or similar installed (right now since they need updates). I tried it on my old updated Minecraft launcher version and a completely fresh re-install of everything. I downgraded to 1.16.5 to see if I made a mistake when installing either, but with these version it worked. I assumed that maybe Forge has a problem with mods in general so I removed OptiFine and installed a different one (in this case Inventory HUD+). Yes, they are completely different and have nothing in common, but I just wanted to be sure on that part. This mod worked fine with Forge. Haven't tested it with any more mods since a lot need to be updated for 1.17 Forge so I can't tell if mods more similar to OptiFine have the same issues. Concluding this I'm actually not sure if the problem lies with Forge, OptiFine or if the communication between both is off. I also haven't seen any error reports on their side so far but that doesn't mean much. debug log from the logs-folder: https://pastebin.com/i9kUDk9x log from the game launcher: https://pastebin.com/8W8C1kvn Thank you for any help

I have been struggling with this as well. I only have 3 mods: Create, flywheel, and JEI. Forge, by itself, will load fine. Adding any one of these three individually to the mod folder results in a crash with Error Code: 0. Adding all three, same result. -WyoMonkey

its strength, you can use the forge bot on discord to convert the mapping names (mcp -> moj & moj -> mcp)

I've noticed a bug that seems to be preventing Wither Skeletons and Guardians from spawning with minecraft forge installed. I have tried every version of forge for 1.17.1 (37.0.0 to 37.0.27) with no mods installed. I located a nether fortress and state for 30min with each instances and the only mobs that would spawn would be Blazes from the spawner itself, no skeletons or Wither Skeletons would be present at all. I then loaded a vanilla minecraft without forge and went to a nether fortress and within 4 minutes of being at the fortress 8 withers and a few normal skeletons spawned. I then went back to the modded version and double checked with a new world and the same result of nothing spawning happened. I traveled to the Ocean Monument and searched around only to find the bosses and cod would spawn. I've also tried other version of java ranging from jre-8u301x64, openJDK16Ux64 and older versions. I'm unsure as to what could be causing this and I'm up for running some more tests if there is anything I can help with. I'm also using CurseForge for my modded minecraft.

quote by diesieben07: "Optifine is not at all compatible with Forge on 1.17 yet." so don't use Optifine -> you can use the vanilla Spyglass😅

This has happened to me as well, I believe that there are multiple other people who are experiencing the same problem. Try making sure that your forge is completely up to date (at the time of writing this is 1.17.1 - 37.0.7). I’m no expert, (I leave that to the experts) so just hold on and im sure the forge team are working on a fix.

Care to cite your sources?

Fair enough, but to me, for new coders, like me, it's a little aggressive, because I use W3Schools for my coding, and sometimes it can be confusing(and its even more so with me being low scale autistic). I just was wondering, x D