French store issue with "state_id".

[juliovich]

I'm trying to build a store to sell in France (only in France by the moment).
Now I'm blocked in the checkout process. When I try to test the checkout, I get always the same message:

• Billing address state can't be blank
• Shipping address state can't be blank.

I'm filling the form by hand with a real french address.

And this is my Zones setting;

This is my rails server log;

Processing by CheckoutsController#update as HTML
  Parameters: {"authenticity_token"=>"[FILTERED]", "order"=>{"email"=>"juliovich@protonmail.ch", "bill_address_attributes"=>{"name"=>"Der Mij", "address1"=>"35, Allée des pins de la ruade ", "address2"=>"", "city"=>"Gujan", "country_id"=>"75", "state_id"=>"", "zipcode"=>"33470", "phone"=>"0787149989"}, "use_billing"=>"1", "ship_address_attributes"=>{"name"=>"Der Mij", "address1"=>"35, Allée des pins de la ruade 33470 Gujan", "address2"=>"", "city"=>"Gujan", "country_id"=>"75", "state_id"=>"", "zipcode"=>"33470", "phone"=>"0787149989"}}, "commit"=>"", "save_user_address"=>"1", "state"=>"address"}