I've seen the other question on here about loading jQuery in a Greasemonkey. Having tried that method, with this require statement inside my ==UserScript== tags:

// @require    http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js

I still get the following error message in Firefox's error console:

Error: Component is not available
Source File: file:///Users/greg/Library/Application%20Support/
       Firefox/Profiles/xo9xhovo.default/gm_scripts/myscript/jquerymin.js
Line: 36

This stops my greasemonkey code from running. I've made sure I included the @require for jQuery and saved my js file before installing it, as required files are only loaded on installation.

Code:

// ==UserScript==
// @name           My Script
// @namespace      http://www.google.com
// @description    My test script
// @include        http://www.google.com
// @require        http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js
// ==/UserScript==

GM_log("Hello");

I have Greasemonkey 0.8.20091209.4 installed on Firefox 3.5.7 on my Macbook Pro, Leopard (10.5.8). I've cleared my cache (except cookies) and have disabled all other plugins except Flashblock 1.5.11.2, Web Developer 1.1.8 and Adblock Plus 1.1.3.

My config.xml with my Greasemonkey script installed:

<UserScriptConfig>
<Script filename="myscript.user.js" name="My Script" 
 namespace="http://www.google.com" description="My test script" enabled="true" 
 basedir="myscript">
    <Include>http://www.google.com</Include>
    <Require filename="jquerymin.js"/>
</Script>

I can see jquerymin.js sat in the gm_scripts/myscript/ directory.

Additionally, is it common for this error to occur in the console when installing a Greasemonkey script?

Error: not well-formed
Source File: file:///Users/Greg/Documents/myscript.user.js
Line: 1, Column: 1
Source Code:
   // ==UserScript==