Fatal error: Uncaught PDOException: SQLSTATE[23000]: Integrity constraint violation: 1451 Cannot delete or update a parent row: a foreign key constraint fails (`notasdaw`.`evaluacion`, CONSTRAINT `fk_estudiante_has_materia_materia1` FOREIGN KEY (`materia`) REFERENCES `materia` (`codigo`)) in /home/daw1/daw1.javicastillo.org/models/Materia.php:25 Stack trace: #0 /home/daw1/daw1.javicastillo.org/models/Materia.php(25): PDOStatement->execute() #1 /home/daw1/daw1.javicastillo.org/controllers/MateriaController.php(23): Materia->delete() #2 /home/daw1/daw1.javicastillo.org/public/index.php(13): MateriaController->delete('123456') #3 {main} thrown in /home/daw1/daw1.javicastillo.org/models/Materia.php on line 25