Fatal error: Uncaught ArgumentCountError: Too few arguments to function get_user_by(), 1 passed in /home/customer/www/moodday.se/public_html/wp-content/themes/moodday3/author.php on line 4 and exactly 2 expected in /home/customer/www/moodday.se/public_html/wp-includes/pluggable.php:99 Stack trace: #0 /home/customer/www/moodday.se/public_html/wp-content/themes/moodday3/author.php(4): get_user_by('elements-spa') #1 /home/customer/www/moodday.se/public_html/wp-includes/template-loader.php(106): include('/home/customer/...') #2 /home/customer/www/moodday.se/public_html/wp-blog-header.php(19): require_once('/home/customer/...') #3 /home/customer/www/moodday.se/public_html/index.php(17): require('/home/customer/...') #4 {main} thrown in /home/customer/www/moodday.se/public_html/wp-includes/pluggable.php on line 99