That error is shown when you launch Config.exe and either the files are missing, or the language.ini is not updated for a list of languages. Since your directory looks correct, I wonder if the language.ini file is not updated? If you navigate to RESOURCE\INI\texts and open language.ini, does it look like this, with the [ConfigList] section at the bottom?
[COMMON]
defaultLanguage = Russian
;defaultLanguage = russian
;defaultLanguage = french
;defaultLanguage = german
;defaultLanguage = dutch
;defaultLanguage = spanish
;defaultLanguage = italian
strings = common.ini
GlobalFile = globals.txt
[DIRECTORY]
English = english
Spanish = spanish
German = german
French = french
Russian = russian
Italian = italian
Dutch = dutch
[FONTS]
English = fonts_eng.ini
Spanish = fonts.ini
German = fonts.ini
French = fonts.ini
Italian = fonts.ini
Russian = fonts_rus.ini
Dutch = fonts.ini
[ConfigList]
cfgLang = Russian