I've got this issue when trying to use Locale / Language field types :

Fatal error: Class 'ResourceBundle' not found in C:\Users\Work\Documents\myproject\sf\vendor\symfony\symfony\src\Symfony\Component\Locale\Locale.php on line 157

... Either for call Symfony\Component\Locale\Locale::getDisplayLanguages( ) or Symfony\Component\Locale\Locale::getDisplayLocales( )

Bad update on my side ? It seems ResourceBundle is missing in vendor folder... Any dependency I am misssing ? i doubt it...

Thanks for your feedback.