Fatal Error When Implementing The Temperature Conversion

Hello,
when i try to add method to ConversionViewController that updates celsiusLabel and build project i have an error: “Thread 1: Fatal error: Unexpectedly found nil while implicitly unwrapping an Optional value”
What i need to do to avoid this problem?
maybe someone can help? i’m stucked

I don’t have the book, but I am guessing that the variable celsiusLabel is an outlet and it is not connected to the corresponding text label object in the UI. Check to make sure that they are connected.

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Thanks a lot!, you are right, it helps! :star_struck: