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Warning: Undefined variable $pdo in /home/me5ir2/public_html/pages/headmain.php on line 66

Fatal error: Uncaught TypeError: retrieveDataFromMySQLTop(): Argument #1 ($pdo) must be of type PDO, null given, called in /home/me5ir2/public_html/pages/headmain.php on line 66 and defined in /home/me5ir2/public_html/pages/headmain.php:53 Stack trace: #0 /home/me5ir2/public_html/pages/headmain.php(66): retrieveDataFromMySQLTop() #1 /home/me5ir2/public_html/index.php(5): require_once('/home/me5ir2/pu...') #2 {main} thrown in /home/me5ir2/public_html/pages/headmain.php on line 53