Fatal error: Uncaught Error: Call to undefined function is_product() in /home/wilson44/dev.wilsonbrothersjewelry.com/wp-content/plugins/woocommerce-better-thumbnail-navigation/woocommerce-better-product-thumbnail-navigation.php:36 Stack trace: #0 /home/wilson44/dev.wilsonbrothersjewelry.com/wp-includes/class-wp-hook.php(298): WC_Better_Product_Thumbnail_Navigation->init('') #1 /home/wilson44/dev.wilsonbrothersjewelry.com/wp-includes/class-wp-hook.php(323): WP_Hook->apply_filters(NULL, Array) #2 /home/wilson44/dev.wilsonbrothersjewelry.com/wp-includes/plugin.php(453): WP_Hook->do_action(Array) #3 /home/wilson44/dev.wilsonbrothersjewelry.com/wp-settings.php(448): do_action('init') #4 /home/wilson44/dev.wilsonbrothersjewelry.com/wp-config.php(89): require_once('/home/wilson44/...') #5 /home/wilson44/dev.wilsonbrothersjewelry.com/wp-load.php(37): require_once('/home/wilson44/...') #6 /home/wilson44/dev.wilsonbrothersjewelry.com/wp-blog-header.php(13): require_once('/home/wilson44/...') #7 /home/wilson44/dev.wilsonbrothersjewe in /home/wilson44/dev.wilsonbrothersjewelry.com/wp-content/plugins/woocommerce-better-thumbnail-navigation/woocommerce-better-product-thumbnail-navigation.php on line 36