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While running the upgrade script in Drupal 6.24 (upgrading from 6.22), I got the following error:
An error occurred. http://example.com/update.php?id=1&op=do
Fatal error: Call to undefined function locale_inc_callback() in /home/www-data/example.com/www/modules/locale/locale.install on line 236
OS: Debian 5.0.9
Web server: Apache 2.2.9 (aka. 2.2.9-10+lenny11)
PHP: 5.2.6 (5.2.6.dfsg.1-1+lenny13)
(However I guess this bug is not related to the environment I'm running Drupal in.)