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Fatal error: Uncaught Error: Call to a member function fetch_row() on bool in /opt/www/internett/php/PHP_Book/eksempler/ch30 - Using PHP with MySQL/retrieving_data.php:12 Stack trace: #0 {main} thrown in /opt/www/internett/php/PHP_Book/eksempler/ch30 - Using PHP with MySQL/retrieving_data.php on line 12