exception_notification gem raises ActionView::Template::Error (code converter not found (UTF-8 to UTF-16)) only on Heroku production mode

Question

I create rails app deployed on Heroku. also, exception_notification gem enabled.

when it is on development setup ActionMailer to Gmail, everything is fine a

Answer 1

I know this is an old post but since I got the same issue some days ago, I wanted to share here that I solved it by forcing the latest version of the gem on my Heroku app.

gem 'exception_notification', '3.0.1'

I guess the problem was with version 3.0.0 and it is fixed on 3.0.1.