Fatal error: Uncaught Error: Call to undefined function block_core_navigation_render_submenu_icon() in /home/rusa8134/public_html/wp-content/plugins/gutenberg/build/scripts/block-library/navigation-submenu.php:243 Stack trace: #0 /home/rusa8134/public_html/wp-includes/class-wp-block.php(596): gutenberg_render_block_core_navigation_submenu(Array, '\n<li class="wp-...', Object(WP_Block)) #1 /home/rusa8134/public_html/wp-content/plugins/gutenberg/build/scripts/block-library/navigation.php(190): WP_Block->render() #2 /home/rusa8134/public_html/wp-content/plugins/gutenberg/build/scripts/block-library/navigation.php(242): WP_Navigation_Block_Renderer_Gutenberg::get_markup_for_inner_block(Object(WP_Block)) #3 /home/rusa8134/public_html/wp-content/plugins/gutenberg/build/scripts/block-library/navigation.php(918): WP_Navigation_Block_Renderer_Gutenberg::get_inner_blocks_html(Array, Object(WP_Block_List)) #4 /home/rusa8134/public_html/wp-content/plugins/gutenberg/build/scripts/block-library/navigation.php(1001): WP_Navigation_Block_Renderer_Gutenberg::get_inner_block_markup(Array, Object(WP_Block_List)) #5 /home/rusa8134/public_html/wp-content/plugins/gutenberg/build/scripts/block-library/navigation.php(1496): WP_Navigation_Block_Renderer_Gutenberg::render(Array, '', Object(WP_Block)) #6 /home/rusa8134/public_html/wp-includes/class-wp-block.php(596): gutenberg_render_block_core_navigation(Array, '', Object(WP_Block)) #7 /home/rusa8134/public_html/wp-includes/class-wp-block.php(576): WP_Block->render() #8 /home/rusa8134/public_html/wp-includes/class-wp-block.php(576): WP_Block->render() #9 /home/rusa8134/public_html/wp-includes/blocks.php(2438): WP_Block->render() #10 /home/rusa8134/public_html/wp-includes/blocks.php(2521): render_block(Array) #11 /home/rusa8134/public_html/wp-content/plugins/gutenberg/build/scripts/block-library/template-part.php(156): do_blocks('<!-- wp:group {...') #12 /home/rusa8134/public_html/wp-includes/class-wp-block.php(596): gutenberg_render_block_core_template_part(Array, '', Object(WP_Block)) #13 /home/rusa8134/public_html/wp-includes/blocks.php(2438): WP_Block->render() #14 /home/rusa8134/public_html/wp-includes/blocks.php(2521): render_block(Array) #15 /home/rusa8134/public_html/wp-includes/block-template.php(291): do_blocks('<!-- wp:templat...') #16 /home/rusa8134/public_html/wp-includes/template-canvas.php(12): get_the_block_template_html() #17 /home/rusa8134/public_html/wp-includes/template-loader.php(132): include('/home/rusa8134/...') #18 /home/rusa8134/public_html/wp-blog-header.php(19): require_once('/home/rusa8134/...') #19 /home/rusa8134/public_html/index.php(17): require('/home/rusa8134/...') #20 {main} thrown in /home/rusa8134/public_html/wp-content/plugins/gutenberg/build/scripts/block-library/navigation-submenu.php on line 243