Last modified: 2011-03-13 18:06:01 UTC
The page at: http://en.wikipedia.org/wiki/Penrose-Hawking_singularity_theorems displays at the bottom in big red letters "Cite error: <ref> tags exist, but no <references/> tag was found". It originally had {{reflist}}, which I replaced with <references/>, but the error did not go away. It does indeed have a <ref> tag, but since it also has a <references/> tag, this error should not be displayed.
It's a known issue where you can't have the references tag before any remaining ref tags in the page.