Invalid auth token on production site

I get this error

Invalid auth token

on my production website (Rails 4) deployed using capistrano and puma.
Just that error on a white screen and nothing else. How do I debug this?

I googled for similar error but all of them are dated and deal with
specfic issue with Safari but for me opening the website in any browser
gives this error.

config.secret_key_base has value defined.

the website works fine on development mode.

You my friend did the same mistake as I did, and specified path tp
pumactl.sock instead of puma.sock, right?

Thanks for this, exactly what I did…