A valid language code value, such as ENG or GER, was not defined for each feature in the reference data. The language code value is essential when building a locator with multilingual reference data so that the language-specific spelling rules and output formats are included in the locator to prevent incorrect assignment of languages in the geocode results.
If you defined a language code by selecting the <As defined in data> option for the Language Code parameter and you mapped a field from your data to the Language Code locator role field in Field Mapping, the field in your data cannot be empty for any records in your dataset.
If all records in your data are in the same language and the language is available in the Language Code parameter drop-down list, select the language for this parameter instead of selecting <As defined in data>. This applies the correct language code to every record in your data.
If the records in your data are in more than one language, you must add the missing language codes to the records where this field is empty or missing.