# query.private.unknown_field_error

- **Module:** query.private
- **Package:** libtmux
- **Language:** Rust
- **Kind:** function
- **Source:** https://github.com/libtmux/libtmux-rs/blob/8a648c0894dfffc9303583f753b6c8ae01f2fe76/crates/libtmux/src/query/private.rs#L881
- **Page:** https://libtmux.org/reference/rs/query-private-unknown_field_error/

```
query.private.unknown_field_error() -> FilterExpressionError
```