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Fatal error: Uncaught Error: Call to a member function query() on null in C:\Apache24\htdocs\soitec\persistencia\MatriculaDAO.php:142 Stack trace: #0 C:\Apache24\htdocs\soitec\xml\xmlGridDisciplinaMa.php(20): MatriculaDAO->consultaDisciplinasMatricula() #1 {main} thrown in C:\Apache24\htdocs\soitec\persistencia\MatriculaDAO.php on line 142