ruby on rails - Test Mail error: no implicit conversion of nil into Hash [SPREE 3.3] -


i'm triying send mails spree keep getting error in production. i'm using heroku deploy de app.

when click "send test mail" error test mail error: no implicit conversion of nil hash.

gemfile:

#spree gems gem 'spree', '~> 3.3.0' gem 'spree_auth_devise', '~> 3.3' gem 'spree_gateway', '~> 3.3' gem 'spree_mail_settings', github: 'spree-contrib/spree_mail_settings'+

my spree configuration: enter image description here

i not know else make thing work. don't know when how spree send mails.

it looks spree_mail_settings removed spree because of having lots of issues , gotchas. i'm removing project , going setup standard rails actionmailer.

http://guides.rubyonrails.org/action_mailer_basics.html#example-action-mailer-configuration


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