Ran into this one today while setting up a local environment with DDEV: PHP Fatal error: Uncaught Error: Call to undefined function cache_get() in /var/www/html/includes/module.inc:754 Stack trace: #0 /var/www/html/includes/module.inc(954): module_implements('system_theme_in...') #1 /var/www/html/modules/system/system.module(2511): module_invoke_all('system_theme_in...') #2 /var/www/html/includes/theme.inc(798): _system_rebuild_theme_data() #3 /var/www/html/includes/theme.maintenance.inc(57): list_themes() #4 /var/www/html/includes/bootstrap.inc(2922): _drupal_maintenance_theme() #5 /var/www/html/includes/errors.inc(179): drupal_maintenance_theme() #6 /var/www/html/includes/bootstrap.inc(2634): _drupal_log_error(Array, true) #7 [internal function]: _drupal_exception_handler(Object(Error)) #8 {main}... Read more »
