update rails

app/controllers/api/attachments_controller.rb

@@ -16,14 +16,14 @@ module Api
         if ImageUtils.blank?(image)
           Rollbar.error("Empty signature: #{submitter.id}") if defined?(Rollbar)
 
-          return render json: { error: "#{params[:type]} is empty" }, status: :unprocessable_entity
+          return render json: { error: "#{params[:type]} is empty" }, status: :unprocessable_content
         end
 
         if ImageUtils.error?(image)
           Rollbar.error("Error signature: #{submitter.id}") if defined?(Rollbar)
 
           return render json: { error: "#{params[:type]} error, try to sign on another device" },
-                        status: :unprocessable_entity
+                        status: :unprocessable_content
         end
       end