Fatal error: Uncaught exception 'PDOException' with message 'SQLSTATE[08004] [1040] Too many connections' in C:\XAMPP\htdocs\elibrary\vendor\yiisoft\yii2\db\Connection.php:600 Stack trace: #0 C:\XAMPP\htdocs\elibrary\vendor\yiisoft\yii2\db\Connection.php(600): PDO->__construct('mysql:host=loca...', 'root', 'Nagoya2023', NULL) #1 C:\XAMPP\htdocs\elibrary\vendor\yiisoft\yii2\db\Connection.php(542): yii\db\Connection->createPdoInstance() #2 C:\XAMPP\htdocs\elibrary\backend\controllers\LanguageController.php(31): yii\db\Connection->open() #3 C:\XAMPP\htdocs\elibrary\frontend\config\main.php(10): require('C:\\XAMPP\\htdocs...') #4 C:\XAMPP\htdocs\elibrary\index.php(13): require('C:\\XAMPP\\htdocs...') #5 {main} Next exception 'yii\db\Exception' with message 'SQLSTATE[08004] [1040] Too many connections' in C:\XAMPP\htdocs\elibrary\vendor\yiisoft\yii2\db\Connection.php:547 Stack trace: #0 C:\XAMPP\htdocs\elibrary\backend\controllers\LanguageController.php(31): yii\db\Connection->open() #1 C:\XAMPP\htdocs\elibrary\frontend\confi in C:\XAMPP\htdocs\elibrary\vendor\yiisoft\yii2\db\Connection.php on line 547