Trying to play Minecraft under ubuntu, can't get it to work. I've tried almost everything.

Here's my terminal (at first I tried MP (resume), then SP as you can see).

haxelnut@ubuntu:~/Desktop/wom_linux$ sudo sh World of Minecraft.sh
[sudo] password for haxelnut:
Constructor for World of Minecraft : java.net.URLClassLoader@190d11
Compass initialized
Linux plugin claims to have found 5 controllers
Replacing with kPlayer
########## GL ERROR ##########
@ Post startup
1281: Invalid value
haxelnut@ubuntu:~/Desktop/wom_linux$ sudo sh World of Minecraft.sh
Constructor for World of Minecraft : java.net.URLClassLoader@190d11
Cookie uid = haxelnut|343f02d08f61d69a670388bf15a7a05f44a45bfc73665d12
Getting server data for: f5cfd6551819e9ee2cf1cd84d28377df
Got user details: haxelnut / 5743318bd4e8aab60e312558e8e2a204
Caught exception: java.io.IOException: Server returned HTTP response code: 500 for URL: https://direct.worldofminecraft.com/validate.php
Cached: null = false
username: haxelnut
sessionid: 5279120919639266710
haspaid: true
haxelnut@ubuntu:~/Desktop/wom_linux$

Help would be appreciated.