Fatal error: Uncaught mysqli_sql_exception: 'siwer_siclon.boleta_det.ID_LIBRO' isn't in GROUP BY in /home/siclondellibro/public_html/config/conexion.php:22 Stack trace: #0 /home/siclondellibro/public_html/config/conexion.php(22): mysqli->query('SELECT boleta_d...') #1 /home/siclondellibro/public_html/index.php(49): ejecutarConsulta('SELECT boleta_d...') #2 {main} thrown in /home/siclondellibro/public_html/config/conexion.php on line 22