ActionView::Template::Error in tracks/exercises#show

[iHiD]

Error in v3

ActionView::Template::Error in tracks/exercises#show
incompatible character encodings: ASCII-8BIT and UTF-8

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Stacktrace

app/views/layouts/application.html.haml:16 - _app_views_layouts_application_html_haml__1282596411461151223_127560
app/controllers/application_controller.rb:269 - render_404
app/controllers/tracks/exercises_controller.rb:46 - rescue in use_exercise!
app/controllers/tracks/exercises_controller.rb:43 - use_exercise!
app/controllers/application_controller.rb:93 - mark_notifications_as_read!
app/controllers/application_controller.rb:21 - process_action

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