SmartCrawl - we weren't able to get meaningful results

Initially when I try to run a scan it returns a 403 forbidden. Tried to whitelist WPMU IP(s), and this one 00.00.00.000 for crawler but get another error:

'SEO: There was an error crawling http://domain.com/, we weren't able to get meaningful results'

I'm using Sucuri if that makes a difference.