Hi There!
Thanks for getting in touch with us. Let me help you with that issue.
I just tried going through the process of buying a ticket until the checkout process and it worked out for me. Are you experiencing this with a particular tickets? If so, please share a link to the event so I can see the issue.
If you get the error when going to the checkout page, then this is on the WooCommerce side of things. I’d suggest you get in touch with their support to see if they can offer some insight about this.
However, I would like to help you out with this and see if there is anything I can do to solve the issue.
Please let me know how that goes.
Thanks,
Victor