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Fatal error: Uncaught Error: Call to a member function getElementById() on null in /home/wacpfgh/public_html/join.php:16 Stack trace: #0 /home/wacpfgh/public_html/htmlAPI.php(346): include_once() #1 /home/wacpfgh/public_html/api.php(2): include_once('/home/wacpfgh/p...') #2 {main} thrown in /home/wacpfgh/public_html/join.php on line 16