Fatal error : Uncaught Error: Call to undefined function is_checkout() in /home/customer/www/vayanalmundo.org/public_html/wp-content/plugins/change-quantity-on-checkout-for-woocommerce/change-quantity-on-checkout-woocommerce.php:89
Stack trace:
#0 /home/customer/www/vayanalmundo.org/public_html/wp-includes/class-wp-hook.php(307): Change_Quantity_On_Checkout->cqoc_add_js('')
#1 /home/customer/www/vayanalmundo.org/public_html/wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters(NULL, Array)
#2 /home/customer/www/vayanalmundo.org/public_html/wp-includes/plugin.php(474): WP_Hook->do_action(Array)
#3 /home/customer/www/vayanalmundo.org/public_html/wp-includes/general-template.php(3058): do_action('wp_footer')
#4 /home/customer/www/vayanalmundo.org/public_html/wp-content/themes/masterstudy/footer.php(13): wp_footer()
#5 /home/customer/www/vayanalmundo.org/public_html/wp-includes/template.php(770): require_once('/home/customer/...')
#6 /home/customer/www/vayanalmundo.org/public_html/wp-includes/template.php(716): load_templ in /home/customer/www/vayanalmundo.org/public_html/wp-content/plugins/change-quantity-on-checkout-for-woocommerce/change-quantity-on-checkout-woocommerce.php on line 89 
