DaemonUmbra

...please name or remove all your launcher profiles before you say that

I meant more the list of launcher profiles, but is this the profile you're launching that crashes?

Yes

I don't like discussing forum things off-forum. Please provide a screenshot of your settings screen.

It's looking like that crash report doesn't match the launcher profile you're looking at

Scroll up a bit to when you posted your crash report.

I'm talking about this from your crash report:

You'll have to go to settings and modify your launcher profile's java arguments to remove the errant -Xmx256 at the end

How did you manage to get 2 -Xmx arguments without knowing how to remove one?

What launcher are you using?

You need to remove the -Xmx256M at the end of your launch arguments, in Java duplicate arguments are applied in a way where the last occurrence of an argument is the occurrence that gets applied, in this case overriding your 3 Gig max with a 256 Meg max.

Please do not hijack threads, if you have an issue please make your own.

minecraftsix is a repost site, please read my signature for more info on why these kinds of sites are bad.

The filenames of some of your mods suggests you are not getting them from official sources, please read my signature for more info on why this is a bad thing.

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

If you can't run the Forge installer how did you get Forge installed in the first place?

Are you having issues installing Forge or getting Minecraft to run with Forge installed?

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

The filenames of some of your mods suggests you are not getting them from official sources, please read my signature for more info on why this is a bad thing.

Try running it from the command line, then show us the output.

Update Java to the latest version of Java 8

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

Open command prompt or terminal (depending on your OS) and type java -version, what shows up?

This is a Twitch Launcher issue, nothing Forge can do to fix Twitch hosting corrupted libraries. A workaround is installing Forge manually into standalone Minecraft (This works even with the launcher installation Twitch uses just as long as you don't launch it THROUGH twitch), then create a launcher profile and point its Game Directory option to the folder of your modpack instance.

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