Nextgen gallery Plugin kann nicht aktiviert werden

Ich habe ein Problem mit der Aktivierung des Plugins :?

Das Plugin kann nicht aktiviert werden, da es einen fatalen Fehler erzeugt.

Warning: include_once() [function.include-once]: Unable to access /customers/memories4u.de/memories4u.de/httpd.www/wp-content/plugins/nextgen-gallery/admin/wp25/admin.php in /customers/memories4u.de/memories4u.de/httpd.www/wp-content/plugins/nextgen-gallery/nggallery.php on line 140

Warning: include_once(/customers/memories4u.de/memories4u.de/httpd.www/wp-content/plugins/nextgen-gallery/admin/wp25/admin.php) [function.include-once]: failed to open stream: No such file or directory in /customers/memories4u.de/memories4u.de/httpd.www/wp-content/plugins/nextgen-gallery/nggallery.php on line 140

Warning: include_once() [function.include]: Failed opening '/customers/memories4u.de/memories4u.de/httpd.www/wp-content/plugins/nextgen-gallery/admin/wp25/admin.php' for inclusion (include_path='.:') in /customers/memories4u.de/memories4u.de/httpd.www/wp-content/plugins/nextgen-gallery/nggallery.php on line 140

Warning: require_once() [function.require-once]: Unable to access /customers/memories4u.de/memories4u.de/httpd.www/wp-content/plugins/nextgen-gallery/lib/nggallery.lib.php in /customers/memories4u.de/memories4u.de/httpd.www/wp-content/plugins/nextgen-gallery/nggallery.php on line 168

Warning: require_once(/customers/memories4u.de/memories4u.de/httpd.www/wp-content/plugins/nextgen-gallery/lib/nggallery.lib.php) [function.require-once]: failed to open stream: No such file or directory in /customers/memories4u.de/memories4u.de/httpd.www/wp-content/plugins/nextgen-gallery/nggallery.php on line 168

Fatal error: require_once() [function.require]: Failed opening required '/customers/memories4u.de/memories4u.de/httpd.www/wp-content/plugins/nextgen-gallery/lib/nggallery.lib.php' (include_path='.:') in /customers/memories4u.de/memories4u.de/httpd.www/wp-content/plugins/nextgen-gallery/nggallery.php on line 168