USPS shipping plugin shows error on checkout.

Hello,

This message indicates that something is preventing your plugin from receiving notifications rates (delivery method prices) from USPS servers.
The reasons for this type of problem can be varied.

For example :
- An address/product configuration in the cart that does not correspond to any possible offer from USPS
- Notification from USPS servers that for one reason or another isn't reaching your site (or plugin)
- A configuration of your merchant account on USPS that does not meet your needs?

These are only theories but to go further, can you provide us with these elements:
- a URL link to your merchant part
- A step-by-step process to reproduce your issue
- Your settings for your HikaShop plugin via a screenshot

Note : You can use (if required) our Contact us form in order to provide these elements, just don't forget to add an Url link to this topic in your message.
Regards