Facebook Feed WD

Fatal error: Uncaught Error: Call to undefined function wp_timezone_string() in /home3/dfczvezdichka/public_html/wp-content/plugins/wd-facebook-feed/frontend/models/FFWDModelBlog_style.php:118 Stack trace: #0 /home3/dfczvezdichka/public_html/wp-content/plugins/wd-facebook-feed/frontend/views/FFWDViewBlog_style.php(1088): FFWDModelBlog_style->ffwd_time(Object(stdClass), 0, '1') #1 /home3/dfczvezdichka/public_html/wp-content/plugins/wd-facebook-feed/frontend/controllers/FFWDControllerMain.php(20): FFWDViewBlog_style->display(Array, 1, 0) #2 /home3/dfczvezdichka/public_html/wp-content/plugins/wd-facebook-feed/frontend/controllers/FFWDControllerMain.php(9): FFWDControllerMain->display(Array, 1, 0) #3 /home3/dfczvezdichka/public_html/wp-content/plugins/wd-facebook-feed/facebook-feed-wd.php(414): FFWDControllerMain->__construct(Array, 1, 0, 'Blog_style') #4 /home3/dfczvezdichka/public_html/wp-content/plugins/wd-facebook-feed/facebook-feed-wd.php(400): ffwd_front_end(Array) #5 /home3/dfczvezdichka/public_html/wp-includes/shortco in /home3/dfczvezdichka/public_html/wp-content/plugins/wd-facebook-feed/frontend/models/FFWDModelBlog_style.php on line 118