I have no idea what that error message means. The html looks ok and works.
More exactly, the preview has an error message of "Error running style: Died in S2::run_code running EntryPage::print(): Can't use an undefined value as an ARRAY reference at (eval 335) line 320.", but it doesn't show up in the actual lj.
This is almost as wonderful as not being able to preview lj-cuts.