Error: La

## Error

```
La
```

## Stack trace

```
/tracks/csharp:468
/tracks/csharp:194 in Xi
/tracks/csharp:195
```

## Tracking Details
- **Project**: exercism-js
- **Sentry**: [Error: La](https://thalamus-ai.sentry.io/issues/145287475/)
- **Culprit**: ?(tracks/csharp)
- **First seen:** Sep 6, 2026

Start with the linked Sentry event and inspect the reported /tracks/csharp locations at lines 468, 194, and 195. Reproduce the “La” error if possible, then identify and address its cause; it is done when the failure no longer produces this Sentry event.

Written by the indexing model from the issue text.