LexManos

If you install it using our installer then it will be fine. As it installs the file it's trying to download. Post the install log, it is created in the same folder you ran the installer. Also show screenshots of what launcher you're using, and post the full log from the launcher. The more information you give the better we can help you. The only way that you could be getting the error that you posted is if the file our installer installs isn't there, so I have to go under the assumption you didn't install it correctly. It *could* be a profile issue. You installed it on your windows profile and not on your daughters. More log files will hell our by saying exactly what was installed where.

Use the installer from http://files.minecraftforge.net/ to install Forge. Whatever you used to install didn't install it correctly.

Then show us the full screenshot of you running the server from the command line. There is ALWAYS a log SOMEWHERE.

This is why posting the FULL LOG FILE is important. It will tell us exactly what files it is scanning for mods and which ones it is loading. Delete the logs folder, re-run it, and give us all the files it creates.

There is for when you load it in Forge. Vanilla doesn't know nore care which is what hes complaining about. That's on Mojang. We've told him to use separate game directories. He thinks thats not good enough. Anyways dont bump old threads.

They are not coming to the Java version. Atleast not for the forseeable future. There, acknowledged.

Wrong log...

Do Not EVER download anything that isn't from the MinecraftForge.net domain. EVER. If it comes with a fancy looking installer, or any bundeled software then it's not Forge. People should feel free to file reports with google about these malicious/abusive website: https://support.google.com/groups/answer/81275?hl=en

Your "mini-utility' is a unknown random binary file that if we are to trust the source you linked does nothing more then copies a few files and runs a command. If we don't trust your source, it could do all kinds of malicious things. If a modder can not manage that on his they shouldn't be modding. So no, your post isn't allowed here.

I don't I'm just taking a educated guess. We cant help you more unless you post your logs by trying to run it from the command line and telling us what it says.

You need to use java 8 not java 9. And run it from the command line to get a real error... Also Post useful titles -.-

ya, something you have installed is removing vanilla recipes which breaks the advancements.

How are you running the client? Show screenshots.

There should be more to the logs, showing explciitly what went wrong. However, the vanilla built in advancements are valid syntax so you shouldn't be having this error unless you've changed something. More logs are needed.

The current recommended version is before the library re-write so that doesn't matter. And no the installer will not go around deleting your modlists. That would just be stupid. I've added hardening for broken modlists. That solves this issue, beyond that, you can just delete your json and you'll be fine.

Interesting you are correct that the installer is creating an incorrect json, I wonder when that happened and why it hasn't broken things before now. However, you can just delete the modlist and you'll be fine. I can add hardening for things like this. But doesn't really matter as the modern versions no longer include Mercurius.

"repositoryRoot": "C:/Users/Coolio/AppData/Roaming/.minecraft/server/libraries", Thats your issue that's not a valid repository root. They have always been relative to the MC directory unless you specify "absolute:" before it

Post your mod_list.json files from /mods and /mods/1.12.2/ Seems you've configured it incorrectly.

No, Mods are designed for a specific MC version. Due to things that Mojang does on their end it isn't feasible to make a mod work on multiple versions. You can still play old versions, we just won't help you when it breaks.

You installed Forge which is the issue you originally had, so thats solved. You then mentioned a second crash without following the directions in the EAQ of showing us what the crash was/including your logs. So for all we know you crashes because solar flares excited the electrons in your computer room causing the aurora borealis completely localized in the section of your hard drive that held minecraft.

https://www.digitalcitizen.life/command-prompt-how-use-basic-commands

try using normal command line, instead of powershell. So type cmd And then type the same command.

Remove JujusCoffeeCraft, and tell them to build a real mod. Also update to 1.12.2.

Multicraft is broken then, it should use the installer, or atleast give you the ability to upload all the files the installer generates. 2656+ has a new library dependency, so they need to allow you to install it.