Cannot read property 'node' of undefined Error

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Hi! I hava a question about installation.
I followed your guide in github.

1.clone source
3.gatsby develop

But, I have some wrong message webpage after build.
following is error page.

I really hope to get answer.
Thank you

Hey there, unfortunately I don’t have the anwser, but the same problem. Other sources told me so far to remove the trailing slash at siteUrl/apiUrl in /gatsby-config.js, src/utils/siteConfig.js and /.ghost.json.
I had it in a couple of places and removed it, but for me no luck.