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Fatal error: Uncaught TypeError: mysqli_select_db(): Argument #1 ($mysql) must be of type mysqli, bool given in /home/librelej/public_html/agregacar.php:18 Stack trace: #0 /home/librelej/public_html/agregacar.php(18): mysqli_select_db(false, 'librelej_librer...') #1 {main} thrown in /home/librelej/public_html/agregacar.php on line 18