Fatal error: Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, array callback must have exactly two members in /data05/virt106279/domeenid/www.hairtime.ee/htdocs/wp-includes/class-wp-hook.php:326
Stack trace:
#0 /data05/virt106279/domeenid/www.hairtime.ee/htdocs/wp-includes/plugin.php(205): WP_Hook->apply_filters(Array, Array)
#1 /data05/virt106279/domeenid/www.hairtime.ee/htdocs/wp-includes/post-template.php(607): apply_filters('post_class', Array, Array, 30)
#2 /data05/virt106279/domeenid/www.hairtime.ee/htdocs/wp-includes/post-template.php(467): get_post_class(Array, Object(WP_Post))
#3 /data05/virt106279/domeenid/www.hairtime.ee/htdocs/wp-content/themes/twentynineteen/image.php(22): post_class()
#4 /data05/virt106279/domeenid/www.hairtime.ee/htdocs/wp-includes/template-loader.php(106): include('/data05/virt106...')
#5 /data05/virt106279/domeenid/www.hairtime.ee/htdocs/wp-blog-header.php(19): require_once('/data05/virt106...')
#6 /data05/virt106279/domeenid/www.hairtime.ee/htdocs/index.php(17): require('/data05/virt106...')
#7 {main}
thrown in /data05/virt106279/domeenid/www.hairtime.ee/htdocs/wp-includes/class-wp-hook.php on line 326