ruby - rake aborted ! name error uninitialized constant Rails :: API :: Rdoc -


when trying run rake db:migrate in rails error:

rake aborted ! name error uninitialized constant rails :: api :: rdoc

i newbie in ruby on rails following youtube tutorial build web blog application: https://www.youtube.com/watch?v=bi_vnnolsky
in video runs rake db fine, confused why got rake aborted error in command prompt, migration file code is:

class createposts < activerecord::migration    def change      create_table :posts |t|       t.string :title       t.text :body        t.timestamps     end   end  end

would please me this?


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