'Golang: generating core failed: unable to load github.com

I installed golang and started with this tutorial: https://www.howtographql.com/graphql-go/1-getting-started/

When I run:

go run github.com/99designs/gqlgen generate 

I get:

reloading module info
generating core failed: unable to load github.com/my-user/hackernews/graph/model - make sure you're using an import path to a package that exists
exit status 1

What is wrong with my setup? This is my gopath

/Users/my-pc-user/go


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