Can't start Forge Server

Hello. I really want to play Aether II with one of my friends, but for that we need a server, which I'm gonna be making, a Forge Server. I've apparently already tried to make a Forge Server before, and when I did, something went wrong. Everytime open the jar file to open the server console, a bunch of messages comes and after that the console just shuts down, no crash message or something. I've already changed the eula to true in both .minecraft and my server files, so that's not the case. I've already configured my start.bat file, which in my case, is a start.command, because I use Mac.

It's really weird, maybe I don't have enough RAM? Is there a way I can check that? I really need a answer, I'd appreciate. I managed to copy and paste all content of the log like 0.5 seconds before it shuts down: http://pastebin.com/fwjigh9V

I've spotted something that may be the problem:

[18:31:04] [main/WARN] [FML]: MOD HAS DIRECT REFERENCE System.exit() THIS IS NOT ALLOWED REROUTING TO FML!
[18:31:04] [main/WARN] [FML]: Offendor: net/minecraft/server/gui/MinecraftServerGui$1.windowClosing(Ljava/awt/event/WindowEvent;)V
[18:31:04] [main/WARN] [FML]: Use FMLCommonHandler.exitJava instead

Thank you so much, any help is really really appreciated.