Fatal error: Uncaught Error: Call to a member function query() on null in C:\Apache24\htdocs\soitec\persistencia\NfDAO.php:200 Stack trace: #0 C:\Apache24\htdocs\soitec\xml\xmlBuscaCAI.php(15): NfDAO->listaNotasCompra() #1 {main} thrown in C:\Apache24\htdocs\soitec\persistencia\NfDAO.php on line 200