# Common errors

## Error: Cannot instantiate interface Magento\Framework\Config\ReaderInterface
Most likely you forgot to enable the module `Loki_Components` and/or the module `LokiCheckout_Core`.

## Exception on unknown group
You might bump into an error similar to this:
```txt
Exception #0 (RuntimeException): Component "loki-checkout.shipping.address.account_type" refers to unknown group "shippingAddressFields"
```

Make sure the `LokiCheckout_Core` module is enabled or disable all other LokiCheckout modules as well.

## Alpine Expression Error: xyz is not defined
This error pops up most of the time, when an AlpineJS component is lazy-loaded via AJAX. While the HTML-part of the component can be lazy-loaded without issue, the data-part (`Alpine.data()`) is a problem, because browsers do not execute script-tags loaded via AJAX. This scenario could pop up when creating your own custom LokiComponent but it should not. 

When the LokiComponent AJAX call loads different HTML-parts from the server and when this new HTML defines a new AlpineJS component including its `Alpine.data()` script, then the error message simply tells you that the data could not be loaded. The solution is: Don't do this. Don't lazy-load `Alpine.data()` via AJAX. 

Instead, make sure the script output is actually always loaded (ideally, as part of the container `loki-scripts`) and switch between the HTML parts by using AlpineJS its `x-show`.

## Failed to read initial data for Loki Component
This is usually caused by an Alpine Component that calls upon `LokiComponentType`, without that component being an actual Loki Component (defined through `etc/loki_components.xml`). For instance, if the following JavaScript would just be inserted into the page and somewhere in the HTML, the HTML attribute `x-data="Foobar"` would be applied, it would result into the error.

```js
Alpine.data('Foobar', () => ({
    ...LokiComponentType,
}));
```

Just make sure to either create a simple Alpine component that is separate from all Loki component types. Or initialize the block as Loki component with an entry in `etc/loki_components.xml`.