Unicode characters break code view

[navignaw]

When viewing a .sml file with unicode characters "as syntax highlighted source," the following 500 error occurs:

--- !ruby/exception:Encoding::CompatibilityError
message: 'incompatible character encodings: UTF-8 and ASCII-8BIT'

with stack dump:

/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/core_ext/string/output_safety.rb:181:in `concat'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/core_ext/string/output_safety.rb:181:in `concat'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/actionview-4.2.0/lib/action_view/buffers.rb:12:in `<<'
/opt/autolab/build/Autolab/app/views/layouts/application.html.erb:72:in `_app_views_layouts_application_html_erb__3350891759191431468_70032666770660'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/actionview-4.2.0/lib/action_view/template.rb:145:in `block in render'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/notifications.rb:166:in `instrument'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/actionview-4.2.0/lib/action_view/template.rb:333:in `instrument'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/actionview-4.2.0/lib/action_view/template.rb:143:in `render'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/actionview-4.2.0/lib/action_view/renderer/template_renderer.rb:66:in `render_with_layout'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/actionview-4.2.0/lib/action_view/renderer/template_renderer.rb:52:in `render_template'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/actionview-4.2.0/lib/action_view/renderer/template_renderer.rb:14:in `render'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/actionview-4.2.0/lib/action_view/renderer/renderer.rb:42:in `render_template'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/actionview-4.2.0/lib/action_view/renderer/renderer.rb:23:in `render'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/actionview-4.2.0/lib/action_view/rendering.rb:100:in `_render_template'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/actionpack-4.2.0/lib/action_controller/metal/streaming.rb:217:in `_render_template'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/actionview-4.2.0/lib/action_view/rendering.rb:83:in `render_to_body'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/actionpack-4.2.0/lib/action_controller/metal/rendering.rb:32:in `render_to_body'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/actionpack-4.2.0/lib/action_controller/metal/renderers.rb:37:in `render_to_body'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/actionpack-4.2.0/lib/abstract_controller/rendering.rb:25:in `render'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/actionpack-4.2.0/lib/action_controller/metal/rendering.rb:16:in `render'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/actionpack-4.2.0/lib/action_controller/metal/instrumentation.rb:41:in `block (2 levels) in render'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/core_ext/benchmark.rb:12:in `block in ms'
/var/www/.rbenv/versions/2.2.0/lib/ruby/2.2.0/benchmark.rb:303:in `realtime'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/core_ext/benchmark.rb:12:in `ms'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/actionpack-4.2.0/lib/action_controller/metal/instrumentation.rb:41:in `block in render'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/actionpack-4.2.0/lib/action_controller/metal/instrumentation.rb:84:in `cleanup_view_runtime'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/activerecord-4.2.0/lib/active_record/railties/controller_runtime.rb:25:in `cleanup_view_runtime'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/actionpack-4.2.0/lib/action_controller/metal/instrumentation.rb:40:in `render'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/actionpack-4.2.0/lib/action_controller/metal/implicit_render.rb:10:in `default_render'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/actionpack-4.2.0/lib/action_controller/metal/implicit_render.rb:5:in `send_action'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/actionpack-4.2.0/lib/abstract_controller/base.rb:198:in `process_action'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/actionpack-4.2.0/lib/action_controller/metal/rendering.rb:10:in `process_action'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/actionpack-4.2.0/lib/abstract_controller/callbacks.rb:20:in `block in process_action'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/callbacks.rb:117:in `call'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/callbacks.rb:117:in `call'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/callbacks.rb:151:in `block in halting_and_conditional'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/callbacks.rb:234:in `call'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/callbacks.rb:234:in `block in halting'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/callbacks.rb:151:in `call'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/callbacks.rb:151:in `block in halting_and_conditional'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/callbacks.rb:169:in `call'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/callbacks.rb:169:in `block in halting'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/callbacks.rb:151:in `call'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/callbacks.rb:151:in `block in halting_and_conditional'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/callbacks.rb:169:in `call'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/callbacks.rb:169:in `block in halting'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/callbacks.rb:169:in `call'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/callbacks.rb:169:in `block in halting'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/callbacks.rb:151:in `call'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/callbacks.rb:151:in `block in halting_and_conditional'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/callbacks.rb:234:in `call'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/callbacks.rb:234:in `block in halting'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/callbacks.rb:169:in `call'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/callbacks.rb:169:in `block in halting'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/callbacks.rb:169:in `call'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/callbacks.rb:169:in `block in halting'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/callbacks.rb:92:in `call'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/callbacks.rb:92:in `_run_callbacks'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/callbacks.rb:734:in `_run_process_action_callbacks'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/callbacks.rb:81:in `run_callbacks'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/actionpack-4.2.0/lib/abstract_controller/callbacks.rb:19:in `process_action'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/actionpack-4.2.0/lib/action_controller/metal/rescue.rb:29:in `process_action'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/actionpack-4.2.0/lib/action_controller/metal/instrumentation.rb:31:in `block in process_action'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/notifications.rb:164:in `block in instrument'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/notifications/instrumenter.rb:20:in `instrument'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/notifications.rb:164:in `instrument'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/actionpack-4.2.0/lib/action_controller/metal/instrumentation.rb:30:in `process_action'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/actionpack-4.2.0/lib/action_controller/metal/params_wrapper.rb:250:in `process_action'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/activerecord-4.2.0/lib/active_record/railties/controller_runtime.rb:18:in `process_action'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/actionpack-4.2.0/lib/abstract_controller/base.rb:137:in `process'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/actionview-4.2.0/lib/action_view/rendering.rb:30:in `process'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/actionpack-4.2.0/lib/action_controller/metal.rb:195:in `dispatch'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/actionpack-4.2.0/lib/action_controller/metal/rack_delegation.rb:13:in `dispatch'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/actionpack-4.2.0/lib/action_controller/metal.rb:236:in `block in action'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/actionpack-4.2.0/lib/action_dispatch/routing/route_set.rb:73:in `call'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/actionpack-4.2.0/lib/action_dispatch/routing/route_set.rb:73:in `dispatch'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/actionpack-4.2.0/lib/action_dispatch/routing/route_set.rb:42:in `serve'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/actionpack-4.2.0/lib/action_dispatch/journey/router.rb:43:in `block in serve'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/actionpack-4.2.0/lib/action_dispatch/journey/router.rb:30:in `each'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/actionpack-4.2.0/lib/action_dispatch/journey/router.rb:30:in `serve'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/actionpack-4.2.0/lib/action_dispatch/routing/route_set.rb:802:in `call'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/omniauth-1.2.2/lib/omniauth/strategy.rb:186:in `call!'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/omniauth-1.2.2/lib/omniauth/strategy.rb:164:in `call'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/omniauth-1.2.2/lib/omniauth/strategy.rb:186:in `call!'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/omniauth-1.2.2/lib/omniauth/strategy.rb:164:in `call'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/omniauth-1.2.2/lib/omniauth/strategy.rb:186:in `call!'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/omniauth-1.2.2/lib/omniauth/strategy.rb:164:in `call'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/bundler/gems/exception_notification-f9dee5b5f6a1/lib/exception_notification/rack.rb:28:in `call'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/rack-ssl-enforcer-0.2.8/lib/rack/ssl-enforcer.rb:52:in `call'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/warden-1.2.3/lib/warden/manager.rb:35:in `block in call'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/warden-1.2.3/lib/warden/manager.rb:34:in `catch'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/warden-1.2.3/lib/warden/manager.rb:34:in `call'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/rack-1.6.0/lib/rack/etag.rb:24:in `call'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/rack-1.6.0/lib/rack/conditionalget.rb:25:in `call'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/rack-1.6.0/lib/rack/head.rb:13:in `call'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/actionpack-4.2.0/lib/action_dispatch/middleware/params_parser.rb:27:in `call'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/actionpack-4.2.0/lib/action_dispatch/middleware/flash.rb:260:in `call'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/rack-1.6.0/lib/rack/session/abstract/id.rb:225:in `context'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/rack-1.6.0/lib/rack/session/abstract/id.rb:220:in `call'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/actionpack-4.2.0/lib/action_dispatch/middleware/cookies.rb:560:in `call'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/activerecord-4.2.0/lib/active_record/query_cache.rb:36:in `call'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/activerecord-4.2.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:647:in `call'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/actionpack-4.2.0/lib/action_dispatch/middleware/callbacks.rb:29:in `block in call'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/callbacks.rb:88:in `call'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/callbacks.rb:88:in `_run_callbacks'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/callbacks.rb:734:in `_run_call_callbacks'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/callbacks.rb:81:in `run_callbacks'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/actionpack-4.2.0/lib/action_dispatch/middleware/callbacks.rb:27:in `call'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/actionpack-4.2.0/lib/action_dispatch/middleware/remote_ip.rb:78:in `call'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/actionpack-4.2.0/lib/action_dispatch/middleware/debug_exceptions.rb:17:in `call'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/actionpack-4.2.0/lib/action_dispatch/middleware/show_exceptions.rb:30:in `call'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/railties-4.2.0/lib/rails/rack/logger.rb:38:in `call_app'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/railties-4.2.0/lib/rails/rack/logger.rb:20:in `block in call'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/tagged_logging.rb:68:in `block in tagged'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/tagged_logging.rb:26:in `tagged'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/tagged_logging.rb:68:in `tagged'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/railties-4.2.0/lib/rails/rack/logger.rb:20:in `call'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/actionpack-4.2.0/lib/action_dispatch/middleware/request_id.rb:21:in `call'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/rack-1.6.0/lib/rack/methodoverride.rb:22:in `call'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/rack-1.6.0/lib/rack/runtime.rb:18:in `call'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/cache/strategy/local_cache_middleware.rb:28:in `call'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/rack-1.6.0/lib/rack/sendfile.rb:113:in `call'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/railties-4.2.0/lib/rails/engine.rb:518:in `call'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/railties-4.2.0/lib/rails/application.rb:164:in `call'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/railties-4.2.0/lib/rails/railtie.rb:194:in `public_send'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/railties-4.2.0/lib/rails/railtie.rb:194:in `method_missing'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/passenger-4.0.57/lib/phusion_passenger/rack/thread_handler_extension.rb:74:in `process_request'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/passenger-4.0.57/lib/phusion_passenger/request_handler/thread_handler.rb:141:in `accept_and_process_next_request'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/passenger-4.0.57/lib/phusion_passenger/request_handler/thread_handler.rb:109:in `main_loop'
/var/www/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/passenger-4.0.57/lib/phusion_passenger/request_handler.rb:455:in `block (3 levels) in start_threads'

(The offending character: →)

[dlbucci]

I'm currently trying to fix this.