# Add-ons

{% hint style="warning" %}
DeluxeMenus & CommandPanels has different feature to offer!
{% endhint %}

## <i class="fa-screwdriver-wrench">:screwdriver-wrench:</i> Fix "is not a valid username/uuid"

<figure><img src="https://19293073-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fezy454jmaPSs8YCKmMyy%2Fuploads%2FKhr0HcVmcPGDVU33Jyyh%2Fimage.png?alt=media&#x26;token=91906de2-b384-4777-b44f-2e7c12224419" alt=""><figcaption></figcaption></figure>

To fix, this issue we need to head over to:

> File Location
>
> `plugins\LuckPerms\config.yml`

<figure><img src="https://19293073-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fezy454jmaPSs8YCKmMyy%2Fuploads%2F7QKF7MoAnzZtJPni97Rq%2Fimage.png?alt=media&#x26;token=6cb39215-f01b-40c3-acdf-9b96761c1c68" alt=""><figcaption></figcaption></figure>

Head over to this line Nu. `692` or else `CTRL+F` + "`allow-invalid-username`", And change the value from `false` to `true`.

{% hint style="danger" %}
After the Modification, IT IS **RECOMMENDED** TO **RESTART** YOUR **SERVER**!
{% endhint %}

## <i class="fa-image-polaroid">:image-polaroid:</i> Bedrock UserInterface Preview

<figure><img src="https://19293073-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fezy454jmaPSs8YCKmMyy%2Fuploads%2Fl90YLTQdc63pr2x7Iki1%2Fimage.png?alt=media&#x26;token=80a278b2-0478-49e0-a535-7b430965671b" alt=""><figcaption></figcaption></figure>

<figure><img src="https://19293073-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fezy454jmaPSs8YCKmMyy%2Fuploads%2FVVWBkV5kMAc5XEQADZKi%2Fimage.png?alt=media&#x26;token=ebce21d6-dfe2-4266-b6cb-b910f07d7e7f" alt=""><figcaption></figcaption></figure>

<figure><img src="https://19293073-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fezy454jmaPSs8YCKmMyy%2Fuploads%2F1AQETY3M0GNz8UCEBmC0%2Fimage.png?alt=media&#x26;token=03dad463-5f13-464f-9927-a3cd05e31ba4" alt=""><figcaption></figcaption></figure>