```ruby
require 'noosfero/core_ext/string'
require 'noosfero/core_ext/integer'
require 'noosfero/core_ext/active_record'
require 'noosfero/core_ext/action_mailer'

```

Remove require of removed filed
user
```ruby
require 'noosfero/core_ext/string'
require 'noosfero/core_ext/integer'
require 'noosfero/core_ext/active_record'

```
assistant