whitespace before doctype

Dear support team, I just installed your Catch responsive theme on my dev. env. (all plugins are disabled) and I see a whitespace before a doctype declaration see: view-source:http://dev.amruta.org/ the whitespace prevents me to test the plugin xml-sitemap-feed which is very strict and does not allow the whitespace.. It looks like the problem is with the theme because on Twenty Sixteen theme there is no whitespace visible and the plugin works. thank you Radoslaw