Just add session_start() in the ./index.php

In /core/src/Model/Model.php at line 40 :
Just add & before the $value

private function _bindParams(&$request) { foreach ($this->params as $key => &$value) { $request->bindParam($key, $value, ((is_int($value)) ? PDO::PARAM_INT : PDO::PARAM_STR)); } }

Actualy the buildUrl function located in /core/include/functions.php take in consideration only if the project are stored in one subfolder (Eg. localhost/project_name) (Cf. Line 34)
It would be better to juste test if count($script_name_exploded) is upper than 1 and do a for to adding $script_name_exploded[0] , $script_name_exploded[1] , $script_name_exploded[n], etc