Exception: Error with message "Class yii\codeception\TestCase not found"

So I am just getting started with Codeception (I know, I am late to the game) and Yii2. There is a error I am running into that I don't seem to get fixed.

Problem

1. When I run 'codecept run', I get the error 'Error with message "Class yii\codeception\TestCase not found". Which is strange to me, because when I look for TestCases, I can find multiple TestCases! F.e. in the folders "backend", "console", ..

Information

• Codeception has been installed Globally
• The CodeCeption version I am using is the version 4.1.12
• When I run any command, the console is giving me the message, "Redirecting to Composer-installed version in vendor/codeception".

What am I doing wrong?

If you guys need any information, hit me up!

Thanks!