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I was surprised to notice that there wasn't a single tutorial on this forum which covered the creation of your own Exception classes, so I decided to make a small tutorial for you.
TL;DR - If you don't fancy reading all the details, you may jump straight to the code, as it's pretty self explanatory if you have a basic concept of Exceptions and their hierarchy.
You might be surprised to know that creating your own Exception is as easy, if not easier