Undefined function calls in theme

  • I’m getting tons of these errors on various sites of mine:
    2017-10-30_00:17:04_PHP Fatal error: Call to undefined function the_ID() in /srv/data/web/vhosts/mysite.net/htdocs/wp-content/themes/twentyfifteen/content.php on line 13
    2017-10-30_06:39:10_PHP Fatal error: Call to undefined function get_header() in /srv/data/web/vhosts/mysite.net/htdocs/wp-content/themes/twentyfifteen/archive.php on line 19
    2017-10-30_01:23:25_PHP Fatal error: Call to undefined function get_header() in /srv/data/web/vhosts/mysite.de/htdocs/wp-content/themes/twentysixteen/404.php on line 10
    PHP Fatal error: Call to undefined function _e() in /srv/data/web/vhosts/mysite.com/htdocs/wp-content/themes/twentyfifteen/author-bio.php on line 12
    PHP Fatal error: Call to undefined function get_template_part() in /srv/data/web/vhosts/mysite.com/htdocs/wp-content/themes/twentyseventeen/footer.php on line 22

    It seems that the latest core update removed functions and the 2015 theme hasn’t been updated yet? Some of these errors are in the 2016 and 2017 themes as well…
    Thanks…

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