# query.private.unknown_field_error

- **Module:** query.private
- **Package:** libtmux
- **Language:** Rust
- **Kind:** function
- **Source:** https://github.com/libtmux/libtmux-rs/blob/f0e37052c232636b61d095817046e6bfc8f2ca40/crates/libtmux/src/query/private.rs#L881
- **Page:** https://libtmux.org/en/rs/latest/reference/query-private-unknown_field_error/

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

Construct the source-less generated fallback for an unknown field.

## Example

```rust
use libtmux::query::FilterExpressionErrorKind;
use libtmux::query::__private;
let error = __private::unknown_field_error();
assert_eq!(error.kind(), FilterExpressionErrorKind::UnknownField);
```