PayPal error on payment attempt

I had a customer attempt to pay my first recurring payment invoice and received the following error:

The link you have used to enter the PayPal system is invalid. Please review the link and try again.

I have used single invoices and my clients had no problem.

I’ve checked my PayPal settings and they seem appropriate. I do not have the enhanced payments on my PayPal account, or a “Business Account”.

Can you help?

https://wordpress.org/plugins/wp-invoice/