Client crashes when I try to log in

[Angriff]

I get this message, I found a few posts that had similar errors, but nothing helped me.

Edit: Yes I do have Java

Edit 2: fixed that and the game works, but no music, I did read the sticky and downloaded the file, then I get music on login screen, but nothing past that, didn't quite know where I was supposed to type the command in game that was mentioned in the thread, tried it in just chat and nothing happened.

Now I'm having a problem trying to get pachos client working. I go here:
http://github.com/Pacho/IRC-Extended/downloads
and download haven64windowsfull and then I just guessed and put them in a new folder, tried double clicking all of them, the bat file just brings up a small black screen that quickly disappears, I can get the resolution setting part up, but other than that I have no clue how to make that work.