Hi Eva,
What the error was stating is that there is a robots.txt file already created (not by me), that is blocking Google (and other search engines) from crawling the site. A robots.txt file BLOCKS search engine spiders.
A theme should always come with the option to put a description tag on the site so people can find the site by doing a search.
I’m not sure where the robots.txt file can be found, but based on the error message, my conclusion is that one exists, and that it must have been included with the theme files.