Using #header in ANTLR - header

Question

I'm having trouble getting the "#header" or any other # rule to work in ANTLR. With a very basic grammer, like this:
grammar test;
options {
language = CSharp2;
}
#header {
using System.Collections.Generic;
}
tokens {
TEST;
}
something : TEST*;
TEST : '0' .. '9';
This seems to adhere to the ANTLR documentation and various other examples online, but when I try to generate the output through either ANTLRWorks v1.4 or the ANTLR jar v3.2, I get the following error:
Cannot generate the grammar because:
error(100): [path]\test.g:11:1 syntax error: antlr: [path]\test.g:11:1
unexpected token: tokens {
Which I cannot seem to shake. I am able to generate the lexer and parser successfully without the #header included in the grammar. I have the latest version of Java on Windows:
java version "1.6.0_22"
Java(TM) SE Runtime Environment (build 1.6.0_22-b04)
Java HotSpot(TM) Client VM (build 17.1-b03, mixed mode, sharing)
I assume this is something stone simple and I'm just blind to it, so please bring on the obvious answers.

Answer 1

The error is because those blocks are required to appear in a certain order.
options
tokens
#header
#members
then your rules