Don't put a hyphen on "nogui"
Pause is not part of that command, it goes on the next line, also without a hyphen

1.8 is no longer supported on this forum.

Please update to a modern version of Minecraft to receive support.

Gah, it was fixed in the installer but Forge was never told to use the new installer when building, sorry.

This issue has been fixed in more recent versions of the installer

Have you tried uninstalling and reinstalling the launcher?

If you need those arguments you're launching it with Java 16, which you shouldn't be

1.12 is no longer supported on this forum.

Please update to a modern version of Minecraft to receive support.

Well unless the host can accept batch or bash files as a method of starting the server you're out of luck

Can you be more specific about what happens when you try?

Remove Difficulty Mod

Really old Minecraft versions are no longer supported on this forum.

Please update to a modern version of Minecraft to receive support.

I believe this is symptomatic of trying to run a 1.17.1 server with an older version of Java, you need to use Java 16 to run 1.17.1

How are you trying to open the installer?

Please provide debug.log (more info on where it is and how to provide it in my signature below, just expand the spoiler)

What version are you using? If it's 1.17.1 you MUST use one of the launch scripts provided by Forge

Use one of the paste sites linked in my signature below

Why would you be using the extract option?

Remove Performant and Blame and try again, the provide a fresh debug.log

Please provide debug.log (more info on where it is and how to provide it in my signature below, just expand the spoiler)

Please provide debug.log and stop using a pirate launcher on the side

You appear to have WorldEdit for 1.16.5 installed on 1.17.1, this is probably not going to work

Have you accepted the eula?

This issue has been fixed in recent versions of the installer

This issue has been fixed in more recent installers

You tried to run a 1.17.1 mod on 1.16.5, this is not going to work