Apply database updates...
<br />
<b>Fatal error</b>:  Uncaught Error: Call to undefined function passthru() in /home/yukonw3creatives/public_html/vendor/evolvingweb/drupal-ci/pantheon/quicksilver/drush_update_db.php:5
Stack trace:
#0 {main}
  thrown in <b>/home/yukonw3creatives/public_html/vendor/evolvingweb/drupal-ci/pantheon/quicksilver/drush_update_db.php</b> on line <b>5</b><br />