Fatal error: Uncaught Error: Call to undefined function is_login() in /var/www/html/wp-content/plugins/link-library/link-library.php:41
Stack trace:
#0 /var/www/html/wp-settings.php(428): include_once()
#1 /var/www/html/wp-config.php(81): require_once('/var/www/html/w...')
#2 /var/www/html/wp-load.php(50): require_once('/var/www/html/w...')
#3 /var/www/html/wp-blog-header.php(13): require_once('/var/www/html/w...')
#4 /var/www/html/index.php(17): require('/var/www/html/w...')
#5 {main}
thrown in /var/www/html/wp-content/plugins/link-library/link-library.php on line 41