marketplace parameter error in get_items()

[sallyz-uptime]

Hello! Has anyone successfully specified and retrieved localised data for a product by supplying the value for the marketplace parameter in get_items()?

I followed the Amazon documentation and supplied the value 'www.amazon.com.br' for marketplace but received the following error:

I have read the source codes in get_items_requests.py carefully, and even tried other values such as 'BR' just in case, but had no luck still. I couldn't figure out where I have gone wrong.

Any pointers would be much appreciated! Thanks!