Fatal error: Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, non-static method runPHP::DetermineAllEvaldPosts() cannot be called statically in /home/www/public_html/wp-includes/class-wp-hook.php:308
Stack trace:
#0 /home/www/public_html/wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters()
#1 /home/www/public_html/wp-includes/plugin.php(517): WP_Hook->do_action()
#2 /home/www/public_html/wp-includes/general-template.php(3043): do_action()
#3 /home/www/public_html/wp-content/themes/bommers/header.php(21): wp_head()
#4 /home/www/public_html/wp-includes/template.php(783): require_once('...')
#5 /home/www/public_html/wp-includes/template.php(718): load_template()
#6 /home/www/public_html/wp-includes/general-template.php(48): locate_template()
#7 /home/www/public_html/wp-content/themes/bommers/warehouse.php(5): get_header()
#8 /home/www/public_html/wp-includes/template-loader.php(106): include('...')
#9 /home/www/public_html/wp-blog-header.php(19): require_once('...')
#10 /home/www/public_html/index.php(17): require('...')
#11 {main}
thrown in /home/www/public_html/wp-includes/class-wp-hook.php on line 308