Language switcher give 404 I need to translate part of a website.
So I had enabled necessary modules : content translation, i18n + i18n sync.
Then create some translation of 2 differents content type (after setting them to enable translation).

Put the Language switcher block active, and it appear on translatable contents.
But when I want to switch, the link is good but system give me a 404.

In permission level, I see nothing to do .

What is missing in my settings ?

Thanks
Solution was here : https://drupal.stackexchange.com/a/150657/8753

For D6 the path is : admin/settings/language/edit/en

No need to set the prefix into the URL provided by pathauto here : admin/build/path/pathauto

in admin/settings/language/configure , both choice between Prefix only or Prefix and alternative solution seem to work.