Hi, this plug-in is very good for preventing spam, Thank you, but I encountered some problems during the use, so I ask for help. When Site Captcha is enabled, the sending of contact email fails.

Error message： "Class mail.manager does not exist" on line 752 of /***/htdocs/vendor/laravel/framework/src/Illuminate/Container/Container.php

I used Contact plug-in is: Flexi Contact