DaemonUmbra

The only thing I can recommend is uninstalling Java completely and then reinstalling it fresh

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

Looks like something has messed with your sig files or something else involved in the authentication process, I'm not sure how to fix this on a Mac.

Sorry, if that pack's on an old version we're not going to be providing support. You'll have to leave the pack behind if you want support.

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

Did you click away from the loading window at any time during the loading process?

Reinstall Forge to restore that file

Potions Master seems to be broken

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

Try adding -Dfml.earlyprogresswindow=false to your JVM args

Please don't necro old threads, especially ones that have nothing to do with your issue.

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

Worth noting last I checked Curse doesn't give a crap what you have installed yourself, it will grab the launcher from Mojang's servers and make its own install, meaning its files are completely separate from your standalone installation and thus won't show up. Make sure you have Curse set to use the native launcher.

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

Are you still having this issue?

Is this pack one you made or one you downloaded?

Are you sure you installed the pack correctly?

I'm talking about your client, what launcher do you use?

I don't see any issues there, and please use a paste site in the future

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

Try Johann Löfflmann's JarFIx utility. Edit: Threads merged

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

User was banned for piracy. Buy the game.

We're getting to the point where I'm questioning if you want to learn or if you just want to complain