Fatal error: Uncaught Error: Call to undefined function pll_register_string() in /usr/src/wordpress/wp-content/themes/blockx/inc/strings.php:2
Stack trace:
#0 /usr/src/wordpress/wp-content/themes/blockx/functions.php(22): require_once()
#1 /usr/src/wordpress/wp-settings.php(585): include('/usr/src/wordpr...')
#2 /usr/src/wordpress/wp-config.php(133): require_once('/usr/src/wordpr...')
#3 /usr/src/wordpress/wp-load.php(50): require_once('/usr/src/wordpr...')
#4 /usr/src/wordpress/wp-blog-header.php(13): require_once('/usr/src/wordpr...')
#5 /usr/src/wordpress/index.php(17): require('/usr/src/wordpr...')
#6 {main}
  thrown in /usr/src/wordpress/wp-content/themes/blockx/inc/strings.php on line 2