Help!help! (Error) The datasource configuration debug_kit was not found in config\app.php

I do not understand why it had such an error. Can anyone help me please show me how.

What CakePHP version are you using?
It seems to me like your app.php isn’t right.

I had the same error today.
Normally this error occurs when the pdo_sqlite extension is not installed.
So in my case I just installed the extension and it solved my problem.
Good luck!