[Redmine] Encoding::CompatibilityError (incompatible character encodings: UTF-8 and ASCII-8BIT):

Tadashi Shigeoka ·  Sun, December 11, 2011

The following error occurred in Redmine 1.2.3.

Encoding::CompatibilityError (incompatible character encodings: UTF-8 and ASCII-8BIT):

The cause of the error was that I was using Ruby version 1.9.2 when I should have been using 1.8.7.

You need to correctly specify and install the Ruby, Rails, and Rack versions that correspond to each version of Redmine.

Redmine をインストールするときに必要な Ruby, Rails, Rack のバージョンを確認できるサイト | CodeNote.net

Also, when changing the Ruby version used on Heroku, please refer to this article:

[Heroku] Rubyのバージョンを変更する | CodeNote.net

That’s all from the Gemba.

【References】

Encoding:CompatibilityError When editing Wiki - Redmine