Ugly error on activation

I’d got an ugly error in my shop page after activation, something like:

/wp-includes/post-template.php(543): apply_filters('post_class', Array, Array, 296) #3 /home/wp-includes/post-template.php(423): get_post_class(Array, NULL) #4 //wp-content/plugins/woocommerce/templates/content-product.php(30): post_class() #5 //wp-includes/template.php(574): require('/home/xxx/...') #6 /home/xxxxx/public_html/xxxxx/wp-content/plugins/woocommerce/includes/wc-core-functions.php(173): load_template('/home/xxxx/...', false) #7 /home/xxxxx in /home/xxxx/xxxx/xxxx/wp-content/plugins/woocommerce/includes/wc-template-functions.php on line 250

I’ve hide some server paths for obvious reasons