If you have classes in the same source in which they are used, you need to make sure the inheritance tree is set up before it is used. Often, this means putting the @ISA = into a BEGIN block.
Your imports appear to me to be useless. re your new and import calls, please try to avoid indirect object syntax ("method $object args", or "method Class args"). Use $object->method(args) or Class->method(args) instead. Indirect object syntax has some gotchas.
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