DaemonUmbra

1.7 is no longer supported on this forum. Please update to a modern version of Minecraft to receive support.

Are you editing things outside your IDE?

1.12 is no longer supported on this forum. Please update to a modern version of Minecraft to receive support.

Do you mean you have OptiForge and Optifine for 1.15.2 in your mods folder? If so, you should know that Forge does not filter mods based on version, this is left for the user to do by setting the "Game Directory" in each of the launcher's "Installations" (really more like profiles or instances).

Make sure your mods lists and configs are identical, some mods do things poorly and register things based on configs which makes saves and connections less stable

That looks like a network issue between your PC and Mojang's servers. Can't really be more specific than that unfortunately.

Try using Gradle's offline switch, ForgeGradle just queries to make sure things are correct and up to date

1.12 is no longer supported on this forum. Please update to a modern version of Minecraft to receive support.

This is why we ask for files and don't like taking "It's the default" or "It's the latest version" for an answer

Show your build.gradle using one of the paste sites in the "Logs" section of my signature below (expand the spoiler)

Sounds like you're using intellij and it thinks your mod is an android project for some reason

Do you see something that says debug?

Crashing is better than getting stuck in a loop, at least a crash results in a log to give us info on what went wrong. Please provide debug.log

Ok then, please provide debug.log, more info on where it is and how we prefer to have it provided are in my signature, just expand the spoiler

Be warned, Optifine is known to be a bit of a bully and doesn't always work with Forge. First, make sure you're using a version of Optifine that is compatible with Forge (check Optifine's changelog), and try using the version of Forge that the changelog says it is compatible with.

That would do it... the latest.log you provided didn't say you were using Twitch though. Please look at the video in the Logs -> Twitch Launcher section of my signature for instructions on how to run a Twitch modpack without running Twitch to launch it, this has been known to solve some issues seemingly out of the blue.

debug.log, in the same folder where you found latest.log

If you don't learn how it works how do you expect to make a mod that's yours and not a complete ripoff of someone else's?

Learn Java before you mod. Modding Minecraft is a HORRIBLE way to learn Java and tutorials like this won't teach you anything if you're just mimicking what they do. Official documentation: https://docs.oracle.com/javase/tutorial/ Absolute basics with an interactive editor: https://www.codecademy.com/learn/learn-java Ongoing online course with assignments: https://java-programming.mooc.fi/

It's not, and this comes from right next to what I asked for

Do you know Java?

So you have Windows set to open .jar files with notepad, this is incorrect. and as the file association with Java and Jar files is a bit special, you'll want to run JarFix once to fix it for you (the alternative is a full reinstall of Java or tweaking the registry yourself)

What code did he have you put in there?

Delete ItemBase, its only use is enabling laziness at the cost of flexibility and sometimes compatibility with other features

First, what tutorial are you following? If it had you make ItemBase it's no good.