pipelist.com on "[Plugin: PayPal for WooCommerce] error 10413 appears when using coupons"

I found this post during a google search of error code 10413.
My website is pipelist.com and I use the woocommerce plugin.
I want to use a coupon to give my clients a discount off a few items, but after entering the coupon code and going to paypal to make the payment, the 10413 error pops up.
my items are adding up correctly in the checkout page, before and after the coupon is added. If i make a coupon for free shipping and apply it at checkout there is not problem. theres only an issue when its the coupons are applied to the cart or to a product.
where can the error be and is there any fix this? Thank you!

https://wordpress.org/plugins/paypal-for-woocommerce/