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在网站中获取致命错误

[29-Nov-2022 17:57:22 Asia/Kolkata] PHP Warning:  Undefined array key 2 in /home2/greendly/public_html/includes/config.php on line 20
[29-Nov-2022 17:57:22 Asia/Kolkata] PHP Fatal error:  Uncaught ArgumentCountError: mysqli_query() expects at least 2 arguments, 1 given in /home2/greendly/public_html/includes/dbClass.php:115
Stack trace:
#0 /home2/greendly/public_html/includes/dbClass.php(115): mysqli_query('set names 'utf-...')
#1 /home2/greendly/public_html/includes/dbClass.php(99): dbClass->setCharset()
#2 /home2/greendly/public_html/includes/dbClass.php(80): dbClass->db_connect()
#3 /home2/greendly/public_html/includes/config.php(44): dbClass->__construct(Array)
#4 /home2/greendly/public_html/sadmin/header.php(2): include_once('/home2/greendly...')
#5 /home2/greendly/public_html/sadmin/register.php(7): include_once('/home2/greendly...')
#6 {main}
  thrown in /home2/greendly/public_html/includes/dbClass.php on line 115

请给予我解决这个致命错误的方法