Exception

exception

The exception action signifies that an exception or error of some type occurred while a command action was being handled. It can be used by the server to raise errors explicitly, such as when an unrecognised action message is received, as well as for exceptions trapped by the server while attempting to carry out commands.

The message attribute contains a string representation of the error.

{
    "action": "exception",
    "message": "MESSAGE"
}