Error
In Club Penguin, an error is typically an orange box that shows up on a client's screen in the form of a notification typically containing a single 'Ok' button that allows the client to close the error, or redirect themselves to a help page.
Example
An example of an error is when attempting to login with an incorrect password. The packet for this error is "%xt%e%-1%101%". You can see the error code on the corner of the orange box given when you recive an error.