In "Informix Find Error" written
Unable to load locale categories.
An invalid locale name was supplied for the locale initialization. The environment variable specifying the locale category has a wrong value.
Check the value of the corresponding environment variable, CLIENT_LOCALE or DB_LOCALE. If this error was encountered when using the "SET COLLATION" statement, check that the value passed to the statement is a valid locale. If this error was encountered when using the "SET NO COLLATION" satatement, check that the session's default locale file is still available. Also check if INFORMIXDIR points to a valid directory where IBM Informix products are installed.
If a client application receives this error when it requests a database server connection, check that the client and database locales are compatible. They are compatible if a valid locale exists on the server computer with the name lg_tr.codeset@mod, where lg_tr (language and territory) and mod (locale modifier) are from the CLIENT_LOCALE and codeset is from the database locale (from the DB_LOCALE, if it is set, or as stored in the database).