# AUR0163

## Error Message

`AUR0163: Expression error: invalid BindingIdentifier at left hand side of "of": "{{expression}}" | kind: {{kind}}`

## Description

This error occurs when the left-hand side of an `of`-based construct (such as `repeat.for`) is not a supported binding identifier.

## Example Trigger

```html
<!-- ❌ Invalid LHS -->
<div repeat.for="a + b of items">${a}</div>
```

## Solution

Use a simple identifier (or supported destructuring, if applicable) on the left-hand side.

```html
<!-- ✅ -->
<div repeat.for="item of items">${item}</div>
```

## Troubleshooting

* Ensure the syntax is `repeat.for="item of items"` (not an arbitrary expression on the left).