# Error command: "!"

By default we have such error message:

<img src="https://3310729168-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-LVh0yg9olT-QWqi3AYt%2Fuploads%2FZFDpBgozLQNe1vB6qVoz%2Fimage.png?alt=media&#x26;token=a6f38cdb-88ca-44ed-b480-76b814215862" alt="" data-size="original">

You can customize this message. Just create command with name "!"

![](https://3310729168-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-LVh0yg9olT-QWqi3AYt%2Fuploads%2Fzp3dHC9raVG1lxHHUEuY%2Fimage.png?alt=media\&token=158d8989-2416-4ab8-a49b-2e7584f1be5d)

{% hint style="success" %}
You also can use BJS in error command
{% endhint %}

{% hint style="warning" %}
Your code on error command must be 100% correct. There are no any error message for error command in chat.
{% endhint %}