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/maxappalao9/public_html/oldappvoices.org/appvoices.org/wp-includes/class-wp-hook.php:324 Stack trace: #0 /home/maxappalao9/public_html/oldappvoices.org/appvoices.org/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(NULL, Array) #1 /home/maxappalao9/public_html/oldappvoices.org/appvoices.org/wp-includes/plugin.php(517): WP_Hook->do_action(Array) #2 /home/maxappalao9/public_html/oldappvoices.org/appvoices.org/wp-includes/general-template.php(3064): do_action('wp_head') #3 /home/maxappalao9/public_html/oldappvoices.org/appvoices.org/wp-content/themes/responsive/header.php(47): wp_head() #4 /home/maxappalao9/public_html/oldappvoices.org/appvoices.org/wp-includes/template.php(810): require_once('/home/maxappala...') #5 /home/maxappalao9/public_html/oldappvoices.org/appvoices.org/wp-includes/template.php(745): load_template('/home/maxappala...', true, Array) #6 /home/maxappalao9/public_html/oldappvoices.org/appvoices.org/wp-includes/general-template.php(48): locate_template(Array, true, true, Array) #7 /home/maxappalao9/public_html/oldappvoices.org/appvoices.org/wp-content/themes/responsive/single.php(20): get_header() #8 /home/maxappalao9/public_html/oldappvoices.org/appvoices.org/wp-includes/template-loader.php(106): include('/home/maxappala...') #9 /home/maxappalao9/public_html/oldappvoices.org/appvoices.org/wp-blog-header.php(19): require_once('/home/maxappala...') #10 /home/maxappalao9/public_html/oldappvoices.org/appvoices.org/index.php(17): require('/home/maxappala...') #11 {main} thrown in /home/maxappalao9/public_html/oldappvoices.org/appvoices.org/wp-includes/class-wp-hook.php on line 324