Fatal error: Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, non-static method AKTT::controller() cannot be called statically in /var/www/wp-includes/class-wp-hook.php:324
Stack trace:
#0 /var/www/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters('', Array)
#1 /var/www/wp-includes/plugin.php(565): WP_Hook->do_action(Array)
#2 /var/www/wp-includes/class-wp.php(830): do_action_ref_array('wp', Array)
#3 /var/www/wp-includes/functions.php(1336): WP->main('')
#4 /var/www/wp-blog-header.php(16): wp()
#5 /var/www/index.php(17): require('/var/www/wp-blo...')
#6 {main}
thrown in /var/www/wp-includes/class-wp-hook.php on line 324
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