Solution:
Check below solutions:-
In your DB,
wp_capabilities should be a:1:{s:13:"administrator";s:1:"1";}
wp_user_level should be 10
If not working then check,
// ** MySQL settings ** //
define('DB_NAME', 'madeupname'); // The name of the database
define('DB_USER', 'madeupuser'); // Your MySQL username
define('DB_PASSWORD', 'madeuppw'); // ...and password
define('DB_HOST', 'mysql.yoursite.com'); // ...and the server MySQL is running on
// Change the prefix if you want to have multiple blogs in a single database.
$table_prefix = 'wp_'; // example: 'wp_' or 'b2' or 'mylogin_'
Check this link also.
Hope it will help you 🙂