I followed the PHP API Quickstart guide http://nationbuilder.com/php_quickstart and was able to easily obtain an access token. However, when I am trying to use the API in any way I get the following error response:

Array ( [result] => Array ( [error] => nation_not_found [message] => The nation identified by this request was not found. ) [code] => 404 [content_type] => application/json )

My nation is safestreets.nationbuilder.com, is there a setting I have to enable in order to use the API? Thanks.