更改名称后在文件中找不到类

I changed the name of every function in this repo: https://github.com/twisted1919/mailwizz-php-sdk

from MailWizzApi_... to MyNameApi_... via Sublime. Now once I run the code it tells me that it can not find the variable MyNameApi_Config in file /examples/setup.php although it is there.

I have already tried running composer update/clean dump etc. what I have found.

Has anybody any Idea on this?

EDIT:

I've changed all classes and names that were named MailWizzApi to MyNameApi including all files via substitute function. That should do the job ... at least normally.