Shipping optons could not be loaded

Using Nop 4.1 with USPS module, it allows shipping for other states but I get this error when trying to place an order for Alabama zip code: 36375.

Problem found, It was set to use first class or Standard. Neither of which is for shipping large box's..

Also, if you will ship to other countries, then you need to select some international methods too.

Hi,

Kindly can you show me how you solved this issue since I'm also experiencing the same. If one puts an address, shipping isn't allowed. Please help.

"Shipping options could not be loaded" will happen for many types of errors.  Check your System > Log to see if any.
Which shipping provider plugins are you using?

In my case we only ship to US and had no errors in the log, so I enabled all shipping options for domestic in the USPS module, when I noticed that I got back a response I went to USPS and looked up the types of shipping definitions and changed it accordingly.