Ugdhar

I would guess that you spelled the filename wrong. use tab completion, get to the word forge then hit tab.

Is this running the mod all by itself so there's only the 1 extra itemgroup, or do you still have 5+? It didn't make a new tab at the bottom for you?

I don't watch video tutorials, sorry. I was looking for step by step explanation of what you did, not a video. How do we know you followed all the steps in the video? Are your path names and *everything* the same? Anyhow, you should be using both eclipse and genEclipseRuns tasks to get setup, either from the commandline, or running the tasks within eclipse. And I'm not sure how to fix your funky character in your path. Maybe just make a folder C:\Modding so you can just avoid it altogether? A good rule of thumb, any type of identifier/name, don't use spaces or special characters.

Please give details on how you set up your workspace

I believe this may be caused by the DISTANCE property in LeavesBlock. It looks at though it only checks for a tree trunk that far from the leaves, so once you get past 7 (default value) they start to decay. Ran into this when messing with learning how to make trees, but never bothered to fix it once I discovered what was going on.

what is "MOSS_STONE"?

If you are running windows, open the folder the installer is in, right-click on a blank spot and choose open command (or powershell) window. then in that window, type java -jar <filename> and press enter. So if the file I downloaded was forge-1.15.2-31.1.37-installer.jar it would be java -jar forge-1.15.2-31.1.37-installer.jar If it fails, type java -version and paste the output here.

I was just letting you know. Once a moderator sees this topic, it will be locked, I just saved them the effort of explaining why.

Try running the installer from the commandline, and see what it outputs.

1.12 is no longer supported on these forums due to age. Please update to a modern version to receive support here. More information on supported versions can be found in the LTS link at the top of every page.

That is the #1 worst way to do things ever. I would not trust the security of any server that was running your mod with a mindset like that, unfortunately

1.12 is no longer supported on these forums due to age. Please update to a modern version to receive support here. More information on supported versions can be found in the LTS link at the top of every page.

Post logs please, and a link to code, preferably a github repo that can be cloned/build/debugged

You won't be able to connect to Skyfactory 4 using 1.15.2, simple as that.

You should probably learn how to make a basic mod first, because I don't think anyone is going to walk through step-by-step explaining every part of how to do it. Not to mention there are probably multiple ways it could be done. Are these items coming from thin air? Are they produced by something, i.e. a block? I'm not trying to give you a hard time, just letting you know that your question is way too broad, and you will probably have a hard time getting a decent answer without more information, and a start to the code/mod to base it on. And then of course, there's the question of forge <-> bukkit interoperability, which I honestly know nothing about.

I still do not think that changes things. If you're running forge, the debug screen is going to say forge no matter what you do.

Then just run vanilla, you can't run mods using forge and then say it as vanilla, it just does not work that way.

Please don't bump threads after so short amount of time, it is considered rude. Give it at least a day. If someone that knows how to help you sees your thread, they will do so.

Skyfactory 4 is 1.12.2, which is no longer supported on these forums. You will not be able to connect to that server using modern and supported versions of forge. (i.e. using the 1.15.2 version you have, which is supported, will not work with that old version, but downgrading to an old version to try and get on there means you cannot get help here if you have problems.) That does not mean that you CAN'T use it/play on it, just that you will have to look elsewhere for help. More information on supported versions can be found in the LTS link at the top of every page.

Ok, so I guess my next question is have you tried anything yet? Like I mentioned, if you share the code for what you have tried, you will get much better results getting someone to help out. And of course, if you do not know any Java (or similar programming language), then this will be impossible to do.

Have you tried anything yet? And what precisely do you mean when you say "plugin"? You will get better results looking for help if you have actually tried something.

1.12 is no longer supported on these forums due to age. Please update to a modern version to receive support here. More information on supported versions can be found in the LTS link at the top of every page.

Why does having it say forge interfere with your "video roleplay"? Why are you trying to do something using forge, and claim that it is vanilla? If you want it to say vanilla, you probably have to run it without forge.

The issue is that a pickaxe doesn't have to be a subclass of PickaxeItem, someone could make a custom pick that is just an Item with pick functionality. So, while you could check for vanilla picks, or your own pick, you wouldn't really have any way of knowing if it was someone else's pick.

I would try installing forge 1.15.2-31.1.30 from files.minecraftforge.net and making a new Installation in the vanilla launcher using that version, then point the installation game directory at the modpack instance folder that twitch installed. The only thing you would have to do is if you updated the pack through the twitch launcher, if it updated the forge version you would have to install/update that manually through the vanilla launcher installation settings.