WordPressを立ち上げて1ヶ月ほどですが、投稿ページ下部に以下のエラーが出て、SNSのシェアボタンが表示されなくなりました。何か対処法はありませんでしょうか？

Warning: include(include/share-buttons.php) [function.include]: failed to open stream: No such file or directory in /home/dddd/www/ssss/wp/wp-content/themes/logistic-child/single.php on line 119

Warning: include() [function.include]: Failed opening 'include/share-buttons.php' for inclusion (include_path='.:/usr/local/php/5.3/lib/php:/home/dddd/www/ssss/wp/wp-content/plugins/mailchimp-widget/lib') in /home/dddd/www/ssss/wp/wp-content/themes/logistic-child/single.php on line 119

Warning: include_once(include/blog-related-posts-navigation.php) [function.include-once]: failed to open stream: No such file or directory in /home/dddd/www/ssss/wp/wp-content/themes/logistic-child/single.php on line 152

Warning: include_once() [function.include]: Failed opening 'include/blog-related-posts-navigation.php' for inclusion (include_path='.:/usr/local/php/5.3/lib/php:/home/dddd/www/ssss/wp/wp-content/plugins/mailchimp-widget/lib') in /home/dddd/www/ssss/wp/wp-content/themes/logistic-child/single.php on line 152