1) Hack a lib/db/caches.php like this: diff --git a/lib/db/caches.php b/lib/db/caches.php index eb9ccdc7ea1..77e117a589f 100644 --- a/lib/db/caches.php +++ b/lib/db/caches.php @@ - 118 , 7 + 118 , 8 @@ $definitions = array(       'config' => array(           'mode' => cache_store::MODE_APPLICATION,           'staticacceleration' => true , -         'simpledata' => true +         'simpledata' => true , +         'requirelockingwrite' => true ,      ),         // Groupings belonging to a course. 2) Make sure debugging is on 2) Now run a cli and confirm that the error shows 'core:config' in the error message php admin/cli/cfg.php --name=wwwroot ++ The cache option requirelockingwrite is deprecated and now has no effect. Consider removing the option, or using requirelockingbeforewrite for the core:config definition ++ * line 387 of /cache/classes/definition.php: call to debugging() * line 470 of /cache/classes/factory.php: call to cache_definition::load() * line 210 of /cache/classes/factory.php: call to cache_factory->create_definition() * line 200 of /cache/classes/loaders.php: call to cache_factory->create_cache_from_definition() * line 1551 of /lib/moodlelib.php: call to cache::make() * line 773 of /lib/setuplib.php: call to get_config() * line 699 of /lib/setup.php: call to initialise_cfg() * line 217 of /config.php: call to require_once() * line 31 of /admin/cli/cfg.php: call to require() https: //master.localhost