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Warning: mysqli::query(): Couldn't fetch mysqli in /var/www/html/crsys/teste_agenda.php on line 20

Fatal error: Uncaught Error: Call to a member function fetch_assoc() on bool in /var/www/html/crsys/teste_agenda.php:23 Stack trace: #0 {main} thrown in /var/www/html/crsys/teste_agenda.php on line 23