SCP Foundation

If the page you are on "looks fine," it is most likely (but not certainly) because its theme is overriding the SCP Wiki's default Sigma-10 theme. If you were to then navigate to a Sigma-10 page, such as the Front Page, it would likely appear broken.

Alternatively, if you know for sure that Sigma-10 is loading, the error is most likely mistakenly appearing because you switched the Sigma-10 theme to a different theme using the ThemePreviewer module or another similar feature. If this is the case, and you are the author of the page, add the following code to it to remove the warning: