Warning: Undefined array key "centro" in /opt/lampp/htdocs/simplesaml/www/app_gestion_cursos/includes/Database.php on line 674

Fatal error: Uncaught TypeError: implode(): Argument #1 ($pieces) must be of type array, string given in /opt/lampp/htdocs/simplesaml/www/app_gestion_cursos/includes/Database.php:674 Stack trace: #0 /opt/lampp/htdocs/simplesaml/www/app_gestion_cursos/includes/Database.php(674): implode('', '', NULL) #1 /opt/lampp/htdocs/simplesaml/www/app_gestion_cursos/C_examenes/xml/xml_document_total.php(49): Database::get_titulaciones() #2 {main} thrown in /opt/lampp/htdocs/simplesaml/www/app_gestion_cursos/includes/Database.php on line 674