Event type "error" not working

[intermx-reddysai]

event: {
type: 'error',
params: {
message: 'Player has fouled out!'
}
}

In the event object, I have given error as the value of the type property.

It is returning the error like, Uncaught, unspecified 'error' event.

If is not allowed value, please update the document.