A field contains a wrong language code.
[1] invalid_language_code rule reference
| Code | invalid_language_code |
|---|---|
| Standard | GTFS |
| Source | MobilityData canonical GTFS Schedule validator |
| Severity | ERROR |
| Category | format |
| Maturity | draft |
| Tags | mobilitydata, gtfs, format |
| Retrieved | 2026-06-12 |
| Reference | https://gtfs-validator.mobilitydata.org/rules.html#invalid_language_code |
