Por favor me ajuda isso e prova questão 1 e 2

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Fatal error: Uncaught Error: mysqli object is already closed in /home/storage/8/1e/34/salvaeu1/public_html/pages/NewAnswer.php:22 Stack trace: #0 /home/storage/8/1e/34/salvaeu1/public_html/pages/NewAnswer.php(22): mysqli->set_charset('utf8') #1 /home/storage/8/1e/34/salvaeu1/public_html/pages/Question.php(408): require_once('/home/storage/8...') #2 {main} thrown in /home/storage/8/1e/34/salvaeu1/public_html/pages/NewAnswer.php on line 22