Editing an institution is throw several exception from ObjectFS

[roperto]

[WAR] 65 (lib/mahara.php:1779) call_user_func_array() expects parameter 1 to be a valid callback, class 'PluginModuleObjectfs' does not have a method 'get_institutionprefs_elements'
Call stack (most recent first):
log_message("call_user_func_array() expects parameter 1 to be a...", 8, true, true, "/var/www/site/lib/mahara.php", 1779) at /var/www/site/lib/errors.php:521
error(2, "call_user_func_array() expects parameter 1 to be a...", "/var/www/site/lib/mahara.php", 1779, array(size 3)) at Unknown:0
call_user_func_array(array(size 2), array(size 1)) at /var/www/site/lib/mahara.php:1779
call_static_method("PluginModuleObjectfs", "get_institutionprefs_elements", object(Institution)) at /var/www/site/lib/institution.php:1057
plugin_institution_prefs_form_elements(object(Institution)) at /var/www/site/admin/users/institutions.php:603