MVC code structure showing white screen output

Hi Gm learvern team and respected Teachers.
ye video jo coding ki same maine file structure maine mere localhost pc pe kiya phir bhi output me white screen aa rahi hai actual output show nahi ho raha hia sir

https://www.learnvern.com/advanced-php-programming-tutorial/php-mvc-file-and-code-structure`

aur maine jo reference ki file download karke bhi kiya phir bhi same output show ho raha hai
white Screen `