"Invalid address" after placing an order

I just updated the woocommerce and setup the “delivery zones” according to its instruction. But my customers complain that it always returns a “Invalid address” after they submit the orders, in fact, I have received the orders as usual, and the delivery cost seems to function well. Only the return words are confusing, it used to be “Your order is placed”, now it appears “Invalid address”.
I did search but coundn’t found any similar situation so that i have a gut feeling it’s only my problom, but I can’t solve it. Thanks for helping, sincerely..

• This topic was modified 8 years, 3 months ago by jajaja365.