Fatal error: Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, non-static method melipayamak_widget::register() cannot be called statically in /home3/sxlgwiiq/public_html/wp-includes/class-wp-hook.php:353 Stack trace: #0 /home3/sxlgwiiq/public_html/wp-includes/class-wp-hook.php(377): WP_Hook->apply_filters(NULL, Array) #1 /home3/sxlgwiiq/public_html/wp-includes/plugin.php(523): WP_Hook->do_action(Array) #2 /home3/sxlgwiiq/public_html/wp-includes/widgets.php(1886): do_action('widgets_init') #3 /home3/sxlgwiiq/public_html/wp-includes/class-wp-hook.php(353): wp_widgets_init('') #4 /home3/sxlgwiiq/public_html/wp-includes/class-wp-hook.php(377): WP_Hook->apply_filters(NULL, Array) #5 /home3/sxlgwiiq/public_html/wp-includes/plugin.php(523): WP_Hook->do_action(Array) #6 /home3/sxlgwiiq/public_html/wp-settings.php(779): do_action('init') #7 /home3/sxlgwiiq/public_html/wp-config.php(179): require_once('/home3/sxlgwiiq...') #8 /home3/sxlgwiiq/public_html/wp-load.php(50): require_once('/home3/sxlgwiiq...') #9 /home3/sxlgwiiq/public_html/wp-blog-header.php(13): require_once('/home3/sxlgwiiq...') #10 /home3/sxlgwiiq/public_html/index.php(17): require('/home3/sxlgwiiq...') #11 {main} thrown in /home3/sxlgwiiq/public_html/wp-includes/class-wp-hook.php on line 353