Fatal error: Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, class "PMProGateway_Zarinpal" not found in /home3/gwfudxem/public_html/wp-includes/class-wp-hook.php:324 Stack trace: #0 /home3/gwfudxem/public_html/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(NULL, Array) #1 /home3/gwfudxem/public_html/wp-includes/plugin.php(517): WP_Hook->do_action(Array) #2 /home3/gwfudxem/public_html/wp-settings.php(578): do_action('plugins_loaded') #3 /home3/gwfudxem/public_html/wp-config.php(181): require_once('/home3/gwfudxem...') #4 /home3/gwfudxem/public_html/wp-load.php(50): require_once('/home3/gwfudxem...') #5 /home3/gwfudxem/public_html/wp-blog-header.php(13): require_once('/home3/gwfudxem...') #6 /home3/gwfudxem/public_html/index.php(17): require('/home3/gwfudxem...') #7 {main} thrown in /home3/gwfudxem/public_html/wp-includes/class-wp-hook.php on line 324