Notice: Undefined variable: conn in /usr/www/users/artefekshh/main/Buildings/type_det.php on line 20

Fatal error: Uncaught Error: Call to a member function query() on null in /usr/www/users/artefekshh/main/Buildings/type_det.php:20
Stack trace:
#0 {main}
  thrown in /usr/www/users/artefekshh/main/Buildings/type_det.php on line 20