I got a error message in blog

Hello team, I got this message in my blog Warning: sprintf(): Too few arguments in /var/www/web582/html/Blog/wp-content/themes/clean-journal/inc/clean-journal-core.php on line 767 I could find already something in your forum, it could be something with the language code which is missing but I cannot find this german folder. I think you can help me. Now want to try clean journal... greetings marga