Thread:Project:Support desk/A database error has occurred. Did you forget to run maintenance/update.php after upgrading?

When trying to install my local MediaWiki, this error occured: A database error has occurred. Did you forget to run maintenance/update.php after upgrading? See: http://www.mediawiki.org/wiki/Manual:Upgrading#Run_the_update_script Query: SELECT lc_value FROM `l10n_cache` WHERE lc_lang = 'de' AND lc_key = 'deps' LIMIT 1 Function: LCStore_DB::get Error: 1146 Table 'my_wiki.l10n_cache' doesn't exist (localhost)

How do I fix this problem?