将网站从CodeIgniter 2.1.4升级到CodeIgniter 3.0.6后，出现此错误我正在使用HMVC。
Fatal error: Uncaught Error: Call to undefined function log_message()
in ../system/database/DB_driver.php:375 Stack trace:
#0 ../system/database/DB.php(201): CI_DB_driver->__construct(Array)
#1 ../application/config/constants.php(105): DB()
#2 ../system/core/CodeIgniter.php(70): require_once('...')
#3 ../index.php(315): require_once('...')
#4 {main} thrown in ../system/database/DB_driver.php on line 375