Why doesn't yii2 see classes on hosting?

Question

Yii

I connected the extension via composer:
$ composer require telegram-bot/api
Then in the controller modules\admin\controllers\BetController.php I execute:

use \TelegramBot\Api\BotApi;
...
//Действия с ботом

Everything works fine on localhost, but not on hosting. Writes the following:
Class 'TelegramBot\Api\BotApi' not found
Although the files are all transferred. I think that the problem is in the case of letters, but I can not understand where. Help plz.

Answer 1

1) Opcache cleared?
2) Have the authoritative compositor maps been rebuilt?

Answer 2

I would launch
and then look for this class in vendor/composer/autoload_classmap.php to understand how the composer loaded it and in what namespace

Answer 3

Register! Check the name of the folders, if the namespace contains the path \TelegramBot\Api\BotApi, then the path through the directories should also be capitalized. The difference between hosting and non-hosting is in the operating system and its file system. On windows, the paths are case-insensitive, on unix, on the contrary, in most cases, the file system, comparing the path TelegramBot\Api and telegramBot\api, sees two completely different paths.