[Plugin: NextGEN Gallery] Getting an error when uploading first image

I get this error:

ERROR: 211.JPG :
Warning: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, 'add_openhook_options_page' was given in /var/www/vhosts/XXX/httpdocs/wp-includes/plugin.php on line 395

Warning: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, 'openhook_settings' was given in /var/www/vhosts/XXX/httpdocs/wp-includes/plugin.php on line 395

Warning: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, 'openhook_cleanup' was given in /var/www/vhosts/XXX/httpdocs/wp-includes/plugin.php on line 395

what is happening here?

http://wordpress.org/extend/plugins/nextgen-gallery/