Warning: Undefined property: Videos::$con in /home/mt000367/public_html/portal/includes/class.Videos.php on line 41

Fatal error: Uncaught TypeError: mysqli_query(): Argument #1 ($mysql) must be of type mysqli, null given in /home/mt000367/public_html/portal/includes/class.Videos.php:43
Stack trace:
#0 /home/mt000367/public_html/portal/includes/class.Videos.php(43): mysqli_query(NULL, 'SELECT * FROM g...')
#1 /home/mt000367/public_html/portal/video_detalle_header.php(12): Videos->leer()
#2 /home/mt000367/public_html/portal/contenidos.php(57): include('/home/mt000367/...')
#3 /home/mt000367/public_html/portal/index.php(19): include_once('/home/mt000367/...')
#4 {main}
  thrown in /home/mt000367/public_html/portal/includes/class.Videos.php on line 43