Deleting the Home.php in Controller and Welcome_message

Hi there.

I just want to bring something under your attend,  and maybe I might be at fault here.

I am trying to build my very own cms and is busy using bootstap 4 for it and your online manual for cdi4. 

And here is the problem I have the online manual.

1) I want to to get rid of the Home.php controller and replace it with a Pages.php in the  controller and replace the welcome_message in the views folder. As per the online manual. But every time I try this I get the following message "Whoops, We seemed to have hit a snag. Please try again Later..." 

I have created a pages folder and have put inside that folder a home.php and a about_us.php files.

Please could you explain to me what I did wrong ? ( As i did copy the code from the codi4 website.)

Francois