Upfront error_log file inside theme folder

Hi, I have found an error_log file inside Upfront theme folder with these errors:
[07-Aug-2016 09:20:20 America/Denver] PHP Fatal error: Call to undefined function language_attributes() in /themes/upfront/header.php on line 3
[07-Aug-2016 09:20:22 America/Denver] PHP Fatal error: Call to undefined function wp_footer() in /themes/upfront/footer.php on line 3
[10-Aug-2016 08:56:52 America/Denver] PHP Fatal error: Call to undefined function add_action() in /themes/upfront/library/upfront_functions.php on line 254
What should I do about that? Thank you!