Cannot save order with api python sdk

Hello I am trying to save an order with shopify python sdk but I get a strange error after the save calling:

{'base': ['is invalid']}

what does error mean?

This is not a new thread but I had the same issue, my issue was that I was the product with invalid tags (,tag1, tag2, {})
Seems like the {} is invalid.

I discovered that the problem was caused by an invalid telephone number.