Thread:Project:Support desk/Warning: Parameter 3 to wfGadgetsArticleSaveComplete() expected to be a reference, value given in /includes/Hooks.php on line 117/reply

Check you have the right version of all your extensions (esp. Gadgets) for the version of MediaWiki you have.

The backtrace starts at the wfRunHooks line, which makes me think you might have a hook entry registering a function without the corresponding function. (Do you have a line in LocalSettings.php that begins with $wgHooks['ArticleSaveComplete'][] =. Do you have an extension installed that perhaps has a missing php file or something like that.

1.13 is a really old version of MediaWiki. Perhaps consider upgrading.