Hello out there,

I am using drupal in a multidomain enverionment. Today I was updating the drupal core from 6.4 to 6.10 for nearly 10 domains, using this core. Most domains are using special themes. On three domains I got the following error:

Warning: array_keys() [function.array-keys]: The first argument should be an array in /var/www/web/htdocs/drupal/includes/theme.maintenance.inc on line 217

Warning: Invalid argument supplied for foreach() in /var/www/web/htdocs/drupal/includes/theme.maintenance.inc on line 217

Fatal error: Call to undefined function phptemplate_get_ie_styles() in /var/www/web/htdocs/drupal/themes/garland/maintenance-page.tpl.php on line 23

Has anyone an idea how I can get rid this error / warnings and complete the update for the domains left?
Has anyone an idea why seven domains works with the same core which cases the error on the three?

Tanks.