'this.focusableElements.length' is null or not an object
- In case this helps someone else: the problem was a bad link to
container.css. Not obvious from the error message, but fixing the link
to container.css eliminated the problem.
> I'm in the process of switching over to the latest version of YUI, but
> I'm getting this error from container.js:
> 'this.focusableElements.length' is null or not an object (line 3050)