Why when I click on a link into the WP admin panel I am redirected to a link that doesn’t contains wp-admin prefix, so I obtain 404 error

Why when I click on a link into the WP admin panel I am redirected to a link that doesn’t contains wp-admin prefix, so I obtain 404 error

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)