Gravity form Measurement Pricing

Hello, I’d like some help. I made a module on Gravity form so that, when one opens a Product, it shows that a height and lenght is needed to get a price. still, when one puts the data, and selects buy, while getting redirected, this error pops up : error on gravityforms-product-addons.php on line 1005.

The link to the product is: zerbinifaidate.com/index.php/prodotto/zerbino-rettangolare-con-bordatura-mis-80×60-cm/

the content of the line is: } elseif (get_option(‘woocommerce_cart_redirect_after_add’) == ‘yes’ && $woocommerce->error_count() == 0) {
$url = $woocommerce->cart->get_cart_url();

Also, i think it’s doable, but can I put like… a minimal? Like, the custumer can’t write under 50 cm?

Still, the product gets actually sent with the right pricing and all to the checkout and all, so it’s more of a redirect thing. I honestly dunno how should I change this…
Also, in the order section, i get this weird error:
Undefined variable: return_meta in /home/zerbinif/public_html/wp-content/plugins/wooprodaddons271/classes/class-product-addon-display.php on line 369.
I don’t think this affects in any way but I brought this out anyway.

Thanks to anyone that will help me