1.120.9 Object: error raising

doesNotUnderstand: aMessage

Called by the system when a selector was not found. message is a Message containing information on the receiver

error: message

Display a walkback for the receiver, with the given error message. Signal an `Error' exception (you can trap it the old way too, with `ExError'

halt: message

Display a walkback for the receiver, with the given error message. Signal an `Halt' exception (you can trap it the old way too, with `ExHalt')