Warning: include(admin/dbcon.php): Failed to open stream: No such file or directory in C:\xampp\htdocs\New folder (2)\header_dashboard.php on line 34

Warning: include(): Failed opening 'admin/dbcon.php' for inclusion (include_path='C:\xampp\php\PEAR') in C:\xampp\htdocs\New folder (2)\header_dashboard.php on line 34

Warning: include(navbar_about.php): Failed to open stream: No such file or directory in C:\xampp\htdocs\New folder (2)\about.php on line 3

Warning: include(): Failed opening 'navbar_about.php' for inclusion (include_path='C:\xampp\php\PEAR') in C:\xampp\htdocs\New folder (2)\about.php on line 3
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Warning: Undefined variable $conn in C:\xampp\htdocs\New folder (2)\about.php on line 16

Fatal error: Uncaught TypeError: mysqli_query(): Argument #1 ($mysql) must be of type mysqli, null given in C:\xampp\htdocs\New folder (2)\about.php:16 Stack trace: #0 C:\xampp\htdocs\New folder (2)\about.php(16): mysqli_query(NULL, 'select * from c...') #1 {main} thrown in C:\xampp\htdocs\New folder (2)\about.php on line 16