Got this error on production but can't figure out where the problem is. Same request works fine on local development. But fail on production. I'm building API for mobile client use
Error trace
```
Encoding::UndefinedConversionError: "\xFF" from ASCII-8BIT to UTF-8 ... 39 non-project frames File"/home/deploy/.bundler/example/ruby/2.0.0/gems/activesupport4.1.0/lib/active_support/core_ext/object/json.rb" line 34 in encode File"/home/deploy/.bundler/example/ruby/2.0.0/gems/activesupport4.1.0/lib/active_support/core_ext/object/json.rb" line 34 in to_json File"/home/deploy/.bundler/example/ruby/2.0.0/gems/activesupport4.1.0/lib/active_support/core_ext/object/json.rb" line 34 in to_json_with_active_support_encoder File"/home/deploy/.bundler/example/ruby/2.0.0/gems/activesupport4.1.0/lib/active_support/json/encoding.rb" line 56 in to_json File "/home/deploy/.bundler/example/ruby/2.0.0/gems/json-1.8.1/lib/json/common.rb" line 223 in generate File "/home/deploy/.bundler/example/ruby/2.0.0/gems/json-1.8.1/lib/json/common.rb" line 223 in generate File"/home/deploy/.bundler/example/ruby/2.0.0/gems/activesupport4.1.0/lib/active_support/json/encoding.rb" line 96 in stringify File "/home/deploy/.bundler/example/ruby/2.0.0/gems/activesupport4.1.0/lib/active_support/json/encoding.rb" line 34 in encode File "/home/deploy/.bundler/example/ruby/2.0.0/gems/activesupport-4.1.0/lib/active_support/json/encoding.rb" line 21 in encode File "/home/deploy/.bundler/example/ruby/2.0.0/gems/activesupport-4.1.0/lib/active_support/core_ext/object/json.rb" line 37 in to_json_with_active_support_encoder File "/home/deploy/.bundler/example/ruby/2.0.0/gems/multi_json-1.10.1/lib/multi_json/adapters/json_common.rb" line 21 in dump File "/home/deploy/.bundler/example/ruby/2.0.0/gems/multi_json-1.10.1/lib/multi_json/adapter.rb" line 24 in dump File "/home/deploy/.bundler/example/ruby/2.0.0/gems/multi_json-1.10.1/lib/multi_json.rb" line 136 in dump File "/home/deploy/.bundler/example/ruby/2.0.0/gems/rollbar-0.12.20/lib/rollbar.rb" line 437 in build_payload File "/home/deploy/.bundler/example/ruby/2.0.0/gems/rollbar-0.12.20/lib/rollbar.rb" line 95 in report_exception File "/home/deploy/.bundler/example/ruby/2.0.0/gems/rollbar-0.12.20/lib/rollbar/exception_reporter.rb" line 9 in report_exception_to_rollbar File "/home/deploy/.bundler/example/ruby/2.0.0/gems/rollbar-0.12.20/lib/rollbar/middleware/rails/show_exceptions.rb" line 22 in rescue in call_with_rollbar File "/home/deploy/.bundler/example/ruby/2.0.0/gems/rollbar-0.12.20/lib/rollbar/middleware/rails/show_exceptions.rb" line 19 in call_with_rollbar File "/home/deploy/.bundler/example/ruby/2.0.0/gems/actionpack-4.1.0/lib/action_dispatch/middleware/show_exceptions.rb" line 30 in call File "/home/deploy/.bundler/example/ruby/2.0.0/gems/railties-4.1.0/lib/rails/rack/logger.rb" line 38 in call_app File "/home/deploy/.bundler/example/ruby/2.0.0/gems/railties-4.1.0/lib/rails/rack/logger.rb" line 20 in block in call File "/home/deploy/.bundler/example/ruby/2.0.0/gems/activesupport-4.1.0/lib/active_support/tagged_logging.rb" line 68 in block in tagged File "/home/deploy/.bundler/example/ruby/2.0.0/gems/activesupport-4.1.0/lib/active_support/tagged_logging.rb" line 26 in tagged File "/home/deploy/.bundler/example/ruby/2.0.0/gems/activesupport-4.1.0/lib/active_support/tagged_logging.rb" line 68 in tagged File "/home/deploy/.bundler/example/ruby/2.0.0/gems/railties-4.1.0/lib/rails/rack/logger.rb" line 20 in call File "/home/deploy/.bundler/example/ruby/2.0.0/gems/actionpack-4.1.0/lib/action_dispatch/middleware/request_id.rb" line 21 in call File "/home/deploy/.bundler/example/ruby/2.0.0/gems/rack-1.5.2/lib/rack/methodoverride.rb" line 21 in call File "/home/deploy/.bundler/example/ruby/2.0.0/gems/rack-1.5.2/lib/rack/runtime.rb" line 17 in call File "/home/deploy/.bundler/example/ruby/2.0.0/gems/activesupport-4.1.0/lib/active_support/cache/strategy/local_cache_middleware.rb" line 26 in call File "/home/deploy/.bundler/example/ruby/2.0.0/gems/rack-1.5.2/lib/rack/sendfile.rb" line 112 in call File "/home/deploy/.bundler/example/ruby/2.0.0/gems/railties-4.1.0/lib/rails/engine.rb" line 514 in call File "/home/deploy/.bundler/example/ruby/2.0.0/gems/railties-4.1.0/lib/rails/application.rb" line 144 in call File "/home/deploy/.bundler/example/ruby/2.0.0/gems/unicorn-4.8.2/lib/unicorn/http_server.rb" line 572 in process_client File "/home/deploy/.bundler/example/ruby/2.0.0/gems/unicorn-4.8.2/lib/unicorn/http_server.rb" line 666 in worker_loop File "/home/deploy/.bundler/example/ruby/2.0.0/gems/unicorn-4.8.2/lib/unicorn/http_server.rb" line 521 in spawn_missing_workers File "/home/deploy/.bundler/example/ruby/2.0.0/gems/unicorn-4.8.2/lib/unicorn/http_server.rb" line 140 in start File "/home/deploy/.bundler/example/ruby/2.0.0/gems/unicorn-4.8.2/bin/unicorn_rails" line 209 in <top (required)> File "/home/deploy/.bundler/example/ruby/2.0.0/bin/unicorn_rails" line 23 in load File "/home/deploy/.bundler/example/ruby/2.0.0/bin/unicorn_rails" line 23 in <main> ```
controller is pretty simple
```
def create @work = current_user.works.build(permitted_params.work) if @work.save render json: @work, status: :created else render json: { status: 'error', message: @work.errors.full_messages }, status: :bad_request end end ```
raw request body
```
POST /api/my/works HTTP/1.1 Host: example.com Cache-Control: no-cache Postman-Token: 98f4ce29-a72e-53e9-98e6-d08bbc4ca6f1 Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryp7MA4YWxkTrZu0gW ----WebKitFormBoundaryE19zNvXGzXaLvS5C Content-Disposition: form-data; name="auth_token" 0e008b699c8904c26cba54ac54a5bb49 ----WebKitFormBoundaryE19zNvXGzXaLvS5C Content-Disposition: form-data; name="name" blah ----WebKitFormBoundaryE19zNvXGzXaLvS5C Content-Disposition: form-data; name="cover_image"; filename="IMG_1755.JPG" Content-Type: image/jpeg ----WebKitFormBoundaryE19zNvXGzXaLvS5C Content-Disposition: form-data; name="model" iPad Air ----WebKitFormBoundaryE19zNvXGzXaLvS5C Content-Disposition: form-data; name="work_type" is_public ----WebKitFormBoundaryE19zNvXGzXaLvS5C ```
enviroments
Rails 4.1.1 Ruby 2.0