Problems with checkout in Powerstore 4.5
I am getting reports that customers are unable to check out due to the following error: "Your transaction could not be completed due to a problem occurring while calculating shipping." It seems to be random. It happens a few times a week. Different customers, different addresses. I have checked their addresses for errors and I don't see anything wrong. Customers are getting frustrated and leaving due to this issue.
Any help is greatly appreciated.