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Fatal error: Uncaught Error: Only variables can be passed by reference in /srv/users/integral-rto/apps/integral-rto/public/wp-content/themes/theme/page-course.php:12 Stack trace: #0 /srv/users/integral-rto/apps/integral-rto/public/wp-includes/template-loader.php(106): include() #1 /srv/users/integral-rto/apps/integral-rto/public/wp-blog-header.php(19): require_once('/srv/users/inte...') #2 /srv/users/integral-rto/apps/integral-rto/public/index.php(17): require('/srv/users/inte...') #3 {main} thrown in /srv/users/integral-rto/apps/integral-rto/public/wp-content/themes/theme/page-course.php on line 12