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What does "Fatal error: Unexpectedly found nil while unwrapping an Optional value" mean?

#1
My Swift program is crashing with `EXC_BAD_INSTRUCTION` and one of the following similar errors. What does this error mean, and how do I fix it?

> Fatal error: Unexpectedly found nil while unwrapping an Optional value

*or*

> Fatal error: Unexpectedly found nil while implicitly unwrapping an Optional value

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