Issue with subfolder installation

[suiz0]

So I'm working on an app which seems to be working fine in localhost but when I deploy it to a hosting (in a subfolder) the routes start to fail with:
App\Controllers\AuthController not found. Cross-check the namespace if you're sure the file exists

I'm registering the namespace:
app()->setNamespace('\App\Controllers');

This is the app layout:

-- app
  -- controllers
     -- AuthController.php
     -- MembersController.php
  -- routes
     -- index.php
-- index.php
-- .htaccess

Not sure what I'm missing, regards

[suiz0]

So I solved this by adding generating the composer autoload files but I'm still puzzle on how this worked in localhost