fix background worker bug

app/models/asset.rb

@@ -472,7 +472,7 @@ class Asset < ApplicationRecord
     if errors.size > 1
       temp_errors = errors[:file]
       errors.clear
-      errors.set(:file, temp_errors)
+      errors.add(:file, temp_errors)
     end
   end
 

config/environments/development.rb

@@ -4,10 +4,10 @@ Rails.application.configure do
   # In the development environment your application's code is reloaded on
   # every request. This slows down response time but is perfect for development
   # since you don't have to restart the web server when you make code changes.
-  config.cache_classes = false
+  config.cache_classes = true
 
   # Do not eager load code on boot.
-  config.eager_load = false
+  config.eager_load = true
 
   # Show full error reports and disable caching.
   config.consider_all_requests_local       = true