It was pointed out to me by a user of the Elgg 0.6-MediaWiki integration that a file was missing from the distribution zip. The file (error.php) was part of the Elgg 0.4 - MediaWiki integration package, so if you upgraded in place, you would not have seen the problem.

The omission has now been fixed, so if you experienced any problems with the integration, please download the package again and update your installation with the additional error.php file.

Apologies for any inconvenience and puzzlement this may have caused.