Fatal error: Uncaught Error: Typed property DOMDocument::$documentElement must not be accessed before initialization in /home/derham/domains/hawid.ir/public_html/wp-content/plugins/gravityforms/includes/libraries/class-dom-parser.php:334 Stack trace: #0 /home/derham/domains/hawid.ir/public_html/wp-content/plugins/gravityforms/includes/libraries/class-dom-parser.php(155): Gravity_Forms\Gravity_Forms\Libraries\Dom_Parser->is_xml() #1 /home/derham/domains/hawid.ir/public_html/wp-content/plugins/gravityforms/includes/libraries/class-dom-parser.php(112): Gravity_Forms\Gravity_Forms\Libraries\Dom_Parser->should_inject_hooks_js() #2 /home/derham/domains/hawid.ir/public_html/wp-content/plugins/gravityforms/gravityforms.php(7117): Gravity_Forms\Gravity_Forms\Libraries\Dom_Parser->get_injected_html() #3 [internal function]: GFForms::ensure_hook_js_output() #4 /home/derham/domains/hawid.ir/public_html/wp-includes/functions.php(5464): ob_end_flush() #5 /home/derham/domains/hawid.ir/public_html/wp-includes/class-wp-hook.php(324): wp_ob_end_flush_all() #6 /home/derham/domains/hawid.ir/public_html/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters() #7 /home/derham/domains/hawid.ir/public_html/wp-includes/plugin.php(517): WP_Hook->do_action() #8 /home/derham/domains/hawid.ir/public_html/wp-includes/load.php(1279): do_action() #9 [internal function]: shutdown_action_hook() #10 {main} thrown in /home/derham/domains/hawid.ir/public_html/wp-content/plugins/gravityforms/includes/libraries/class-dom-parser.php on line 334