- Addon::unregisterHook('load_config', 'addon/impressum/impressum.php', 'impressum_load_config');
- Addon::unregisterHook('about_hook', 'addon/impressum/impressum.php', 'impressum_show');
- Addon::unregisterHook('page_end', 'addon/impressum/impressum.php', 'impressum_footer');
+ Hook::unregister('load_config', 'addon/impressum/impressum.php', 'impressum_load_config');
+ Hook::unregister('about_hook', 'addon/impressum/impressum.php', 'impressum_show');
+ Hook::unregister('page_end', 'addon/impressum/impressum.php', 'impressum_footer');