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 and sends a notification from Gmail address.

but when it comes to production environment on Heroku, I get following error when server trying to send a email.

ActionView::Template::Error (code converter not found (UTF-8 to UTF-16))

Could anyone tell me what's happening here?

Argyll

Same error here. Heroku guys, if you are reading this, please take into account that it is urgent. We have no idea what's happening here. – Middleman

Addition: we have resolved the problem by removing Windows line endings from our views. – Middleman

Might be a problem with assets not being pre-compiled properly? – Molarity

Answer 1

The issue was raised on the main repository (see here), but so far was not addressed.

You might want to take a look at this fork to the exception_notification gem, specifically this commit which tries to deal with the problem: https://github.com/alanjds/exception_notification/commit/048fc6be972189e62ca3b9453d19233ec5773016

To use this fork I pointed the gem to it, like so:

Gemfile:

gem 'exception_notification', git: 'git://github.com/alanjds/exception_notification.git'

This solved the issue for me.

Lightning

This appears to be a problem in 3.0.0, wiring it down to the latest 2.x version, gem 'exception_notification', '2.6.1' works as well. – Frederigo

Have a look at Marco's newer answer too https://mcmap.net/q/642533/-exception_notification-gem-raises-actionview-template-error-code-converter-not-found-utf-8-to-utf-16-only-on-heroku-production-mode – Case

Answer 2

Quick adjustment to solution by hananamar, otherwise you'll get an error:

gem 'exception_notification', :git => 'git://github.com/alanjds/exception_notification.git', :require => 'exception_notifier'

Calculated

Answer 3

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.

Joint