Thank you for your answer.
Yes, here are the additional messages:
All standard types including "auth" should have plugininfo class!
- line 466 of /lib/classes/plugin_manager.php: call to debugging()
- line 394 of /lib/classes/plugin_manager.php: call to core_plugin_manager::resolve_plugininfo_class()
- line 129 of /admin/settings/plugins.php: call to core_plugin_manager->get_plugins_of_type()
- line 8004 of /lib/adminlib.php: call to require()
- line 19 of /admin/settings.php: call to admin_get_root()
Debug info:
Error code: sectionerror
Stack trace: - line 503 of /lib/setuplib.php: moodle_exception thrown
- line 26 of /admin/settings.php: call to print_error()
Note that I have in my conf.php:
'dbcollation' => 'utf8_unicode_ci' (I am using Antelope file format).
I hope this will help. Is this problem related to my own installation ?