Importing a recursive dump of mediawiki.org/Template: throws many of the following warnings. A stack trace is printed and the experience is quite discouraging ;)
Warning: DOMDocument::load(): I/O warning : failed to load external entity "/X/mediawiki-core/languages/data/plurals-mediawiki.xml" in /X/mediawiki-core/includes/cache/LocalisationCache.php on line 633
Version: 1.23.0
Severity: normal
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=62368