Problem with tutorial

I am new to CakePHP and I was following the Bookmarker Tutorial and ecountered a problem.
at the Getting Bookmarks with a Specific Tag step i continuosly get the error message:
Create the class TaggedController below in file: src/Controller/TaggedController.php
There is nothing about creating such file in the tutorial.

Why am I getting this error?

Any help appreciated.

CakePHP supports pluralization naming convention for the Controllers and Tables. You should create TagsController instead of TaggedController.

can you be more descriptive, like post the lines of code the you used.