Undefined valuable

in get_school method you are returning object of row objects, you need to fetch only one row. 
update your method:

PHP Code:

public function get_school() {
   $query = $this->db->query("SELECT sname FROM setting");
if($query){
 return $query->row();
}
  return false; //or return empty array
} 


use print_r or var_dump functions for debugging your code