Can't Login to Admin Panel!!

  • I recently updated to the latest version of wordpress, and now when I go to my domain this code is listed on top publically:

    Notice: get_theme_data is deprecated since version 3.4! Use wp_get_theme() instead. in /home/XXXXX/public_html/wp-includes/functions.php on line 2839

    When I attempt to login, the following code is added below it:

    Warning: Cannot modify header information – headers already sent by (output started at /home/XXXXX/public_html/wp-includes/functions.php:2839) in /home/XXXXX/public_html/wp-includes/pluggable.php on line 680

    I have downloaded an FTP client to try and fix these problems so that I can login normally again, however, I do not know what is broken. I have checked for space at the beginning of the wp-config.php, but there was none. Please help?

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