# AUR0106

## Error Message

`AUR0106: Ast eval error: invalid assignment. "$host" is a reserved keyword.`

## Description

This error occurs when an expression attempts to assign to `$host`. `$host` is a reserved keyword and is read-only.

## Solution

* Remove the assignment and assign to a real property on your view-model instead.

## More Information

This code is also documented under the runtime-html section: [AUR0106](https://docs.aurelia.io/developer-guides/error-messages/runtime-html/aur0106).