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At first, the information in the walkback window may seem intimidating
because several lines describe messages sent by Smalltalk in the course
of handling the error. Do not despair. Instead, zero in on the line
containing +. That line tells you that the receiver–message
combinations that lead to the error report include a + message sent
to a Weight instance:
*-- Class of receiver
v
Weight>>+
^
*-- Message sent