Raise an exception. The given object should have been an instance
of one of the classes indicated by aClassOrArray (which should be
a single class or an array of classes). Whether instances of
subclasses are allowed should be clear from the context, though
in general (i.e. with the exception of a few system messages)
they should be.
1.194.2 SystemExceptions.WrongClass: accessing
description
Answer a textual description of the exception.
messageText
Answer an exception's message text.
validClasses
Answer the list of classes whose instances would have been valid.
validClasses: aCollection
Set the list of classes whose instances would have been valid.
validClassesString
Answer the list of classes whose instances would have been valid,
formatted as a string.
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