Fatal error: Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, class YITH_Woocompare_Frontend does not have a method "output_button" in /home/h306324/domains/farsmedical.com/public_html/wp-includes/class-wp-hook.php:324 Stack trace: #0 /home/h306324/domains/farsmedical.com/public_html/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters() #1 /home/h306324/domains/farsmedical.com/public_html/wp-includes/plugin.php(517): WP_Hook->do_action() #2 /home/h306324/domains/farsmedical.com/public_html/wp-content/themes/nika/inc/vendors/woocommerce/wc-template-functions.php(972): do_action() #3 /home/h306324/domains/farsmedical.com/public_html/wp-includes/class-wp-hook.php(324): nika_the_yith_compare() #4 /home/h306324/domains/farsmedical.com/public_html/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters() #5 /home/h306324/domains/farsmedical.com/public_html/wp-includes/plugin.php(517): WP_Hook->do_action() #6 /home/h306324/domains/farsmedical.com/public_html/wp-content/themes/nika/woocommerce/item-product/inner-v1.php(61): do_action() #7 /home/h306324/domains/farsmedical.com/public_html/wp-content/plugins/woocommerce/includes/wc-core-functions.php(346): include('/home/h306324/d...') #8 /home/h306324/domains/farsmedical.com/public_html/wp-content/themes/nika/woocommerce/layout-products/layout-products.php(44): wc_get_template() #9 /home/h306324/domains/farsmedical.com/public_html/wp-content/plugins/woocommerce/includes/wc-core-functions.php(346): include('/home/h306324/d...') #10 /home/h306324/domains/farsmedical.com/public_html/wp-content/themes/nika/elementor_templates/products.php(28): wc_get_template() #11 /home/h306324/domains/farsmedical.com/public_html/wp-content/themes/nika/inc/vendors/elementor/abstract/base.php(63): include('/home/h306324/d...') #12 /home/h306324/domains/farsmedical.com/public_html/wp-content/themes/nika/inc/vendors/elementor/abstract/base.php(74): Nika_Elementor_Widget_Base->get_view_template() #13 /home/h306324/domains/farsmedical.com/public_html/wp-content/plugins/elementor/includes/base/controls-stack.php(2374): Nika_Elementor_Widget_Base->render() #14 /home/h306324/domains/farsmedical.com/public_html/wp-content/plugins/elementor/includes/base/widget-base.php(636): Elementor\Controls_Stack->render_by_mode() #15 /home/h306324/domains/farsmedical.com/public_html/wp-content/plugins/elementor/includes/base/widget-base.php(774): Elementor\Widget_Base->render_content() #16 /home/h306324/domains/farsmedical.com/public_html/wp-content/plugins/elementor/includes/base/element-base.php(482): Elementor\Widget_Base->print_content() #17 /home/h306324/domains/farsmedical.com/public_html/wp-content/plugins/elementor/includes/base/element-base.php(1443): Elementor\Element_Base->print_element() #18 /home/h306324/domains/farsmedical.com/public_html/wp-content/plugins/elementor/includes/base/element-base.php(482): Elementor\Element_Base->print_content() #19 /home/h306324/domains/farsmedical.com/public_html/wp-content/plugins/elementor/includes/base/element-base.php(1443): Elementor\Element_Base->print_element() #20 /home/h306324/domains/farsmedical.com/public_html/wp-content/plugins/elementor/includes/base/element-base.php(482): Elementor\Element_Base->print_content() #21 /home/h306324/domains/farsmedical.com/public_html/wp-content/plugins/elementor/core/base/document.php(1887): Elementor\Element_Base->print_element() #22 /home/h306324/domains/farsmedical.com/public_html/wp-content/plugins/elementor/core/base/document.php(1803): Elementor\Core\Base\Document->do_print_elements() #23 /home/h306324/domains/farsmedical.com/public_html/wp-content/plugins/elementor/core/base/document.php(1202): Elementor\Core\Base\Document->print_elements() #24 /home/h306324/domains/farsmedical.com/public_html/wp-content/plugins/elementor/includes/frontend.php(1203): Elementor\Core\Base\Document->print_elements_with_wrapper() #25 /home/h306324/domains/farsmedical.com/public_html/wp-content/plugins/elementor/includes/frontend.php(1098): Elementor\Frontend->get_builder_content() #26 /home/h306324/domains/farsmedical.com/public_html/wp-includes/class-wp-hook.php(324): Elementor\Frontend->apply_builder_in_content() #27 /home/h306324/domains/farsmedical.com/public_html/wp-includes/plugin.php(205): WP_Hook->apply_filters() #28 /home/h306324/domains/farsmedical.com/public_html/wp-includes/post-template.php(256): apply_filters() #29 /home/h306324/domains/farsmedical.com/public_html/wp-content/themes/nika/page.php(28): the_content() #30 /home/h306324/domains/farsmedical.com/public_html/wp-includes/template-loader.php(106): include('/home/h306324/d...') #31 /home/h306324/domains/farsmedical.com/public_html/wp-blog-header.php(19): require_once('/home/h306324/d...') #32 /home/h306324/domains/farsmedical.com/public_html/index.php(17): require('/home/h306324/d...') #33 {main} thrown in /home/h306324/domains/farsmedical.com/public_html/wp-includes/class-wp-hook.php on line 324