# Error: BindKeyOrValueRequired

No key or value was provided to the `data-bind` attribute. The `data-bind` attribute must have either a key _or_ a value, representing the signal name to create and enable two-way binding with the element’s value.

Example:

```html
<input data-bind-signalname/>
```

See the docs on the [`data-bind`](/reference/attribute_plugins#data-bind) attribute.