DaemonUmbra

Are you a Comcast or BT customer?

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If you're referring to a modpack file from Curse, simply putting it in the mods folder doesn't work as it doesn't have the mods in it, it has a manifest pointing to where they are on Curse's servers instead.

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

Try reinstalling Java

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

Were you self-taught in Java?

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Why not just apply a marker when you log things and Ctrl + F for the marker?

Why have it in a separate file though?

Can I ask what you need a custom logger for?

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Forge still has to do work even without any mods installed. Arguments about efficiency are rarely fruitful, a few extra seconds of loading for hours of extra content shouldn't be a dealbreaker.

This is one of the major problems I have with forums, everyone is fighting to get their post to the top and keep it there.

Installing Optifine through their installer doesn't touch the mods folder, it also doesn't install Optifine in a way that Forge would recognize. The presence of Optifine in your mods folder has nothing to do with the Optifine installer and everything to do with you putting it there.

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

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

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

delete the configuration

Delete your config folder

Interesting, this has two errors in it, the one involving Mekanism and one involving Dank Storage requiring mixin to be installed. Evidently MixinBootstrap is a popular way of getting Mixin running at this time.

That's not the right file, the installer log will be in the same folder as the installer, either with the installer's name with .log on the end or simply called "installer.log"

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

Can you provide your debug.log? Is this a modpack or something you made yourself?