Smartcrawl seems to have problems with links that do work

Hi,
I'm having a hard time with running a complete SEO analysis on my site, thedesignsocial.com.
The report that I get back shows some links as being broken broken but they are in fact working. The report also shows that some links can't be crawled but these aren't links that I have set up on the website.
Here's an example of the report.:

Server Error
http://thedesignsocial.com/2016/05/03/inspiration-logo-modernism/
We encountered an issue reaching this page. This means that server encountered a general sort of issue in dealing with our request
Server Error
http://thedesignsocial.com/2016/09/20/craig-smith/
We encountered an issue reaching this page. This means that server encountered a general sort of issue in dealing with our request
Server Error
http://thedesignsocial.com/2016/04/08/portfolio/
We encountered an issue reaching this page. This means that server encountered a general sort of issue in dealing with our request
Discovery
http://thedesignsocial.com/author/barnaby/
SmartCrawl couldn't find this URL in your sitemap, which means Google may not be able to find and index it for search.
Discovery
http://thedesignsocial.com/author/barnaby/page/2/
SmartCrawl couldn't find this URL in your sitemap, which means Google may not be able to find and index it for search.

The first three are links to individual blog posts but the links work just fine, so I'm not sure why these are getting flagged up.
The last two are links that I haven't created & don't want.
Please can you give me a steer on how to fix these?