Robots.txt 
Autor: Donald M.
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Why is Google's SEO checker telling me my robots.txt is not set up when it is (as far as I can tell) ?
www.dmacd.co.uk/wl
Gepostet am
mahh, I see that the file is obviously a fake from Google, a wrong reading, check directly on search console
Autor
Google isn't the only one, other checkers are saying the same thing.
I saw that your site does not have an SSL certificate (https), this could also be a problem, activate it on your hosting
Is it possible that the domain is not called www.dmacd.co.uk/wl but www.dmacd.co.uk? In this case, the robots.txt must be stored one level higher in the server's directory tree.
Autor
Yes, this site is in a subfolder (WL) so that my customer can view its progress while it's being constructed. It will be transferred to his domain when it's completed.
I just uploaded a robots.txt file to the root and the SEO checker is no longer complaining.