DaemonUmbra

Does it appear if you remove the formatting? (That's not how you're supposed to do formatting btw)

delete confg/fml.toml

Try re-running the installer

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

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

Please provide a screenshot of your launcher

Honestly someone who is following a tutorial to learn isn't exactly in a position to tell how good that tutorial is at not promoting bad practices. A few of us went over one of his recent videos and found several issues with it not just regarding Forge, but regarding Java practices. And if he has an issue he can talk to us himself rather than sending fans after us.

We don't keep track

In the future please use one of the sites listed in the "Logs" section of my signature below. Go into config and delete fml.toml

No it's not, but it has enough info for this particular issue, go into config and delete fml.toml

Did you mess with the files manually at all? Did the installer have any errors?

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

We will not provide support for custom clients, especially not cheats or "hacks".

Please read the Logs section of my signature below and provide the appropriate log in the appropriate manner.

User was banned for piracy. Buy the game.

I mean how long have you left the window open like that before killing it?

Don't DM moderators just because you're impatient... The crash is because Mystical World doesn't properly indicate that it depends on Patchouli in its mods.toml, so Forge can't show a more civilized error screen. Please read the info pages of mods you install

How long have you allowed it to sit?

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

Portality and Industrial Foregoing need to be updated after a change in Forge.

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.

You will not receive assistance doing something we explicitly have told you not to do.

Try adding -Dfml.earlyprogresswindow=false to your launch arguments