Connection error :SQLSTATE[HY000] [1044] Access denied for user 'firstmat_wedding_info'@'localhost' to database 'firstmat_wedding_info' Wedding Info

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Hello,
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 Hello, Buyer
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 Hello, Astrologer
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Fatal error: Uncaught Error: Call to a member function prepare() on null in /home/firstmat/public_html/wedding.info.firstmatrix.in/profile-setting.php:7 Stack trace: #0 {main} thrown in /home/firstmat/public_html/wedding.info.firstmatrix.in/profile-setting.php on line 7