Excuse me, what is going on? This is my first time using yii2, please give me some advice.
Mongodb3.2.4 installed locally, yii2 installed by composer.
The permissions of mongodb have been configured better,
Before using auth, the show dbs command cannot be used
After using auth verification, you can use the show dbs command to indicate that auth has been configured
yii2 configuration is as follows
composer.json
comp in web.php The configuration in onents 
in the controller is as follows 
and then an error is reported in the browser
Excuse me, what is going on? This is my first time using yii2, please give me some advice.
