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# getting-started

[Slackbot]

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[marstran]

What error? Do you have the error message?

[Gichohi Simon]

Error:(24, 17) Kotlin: Smart cast to 'Int' is impossible, because 'age' is a mutable property that could have been changed by this time

[tddmonkey]

I’m not sure what else we can tell you that the compiler error doesn’t!

[Gichohi Simon]

i get it now, just getting used to programming, will be more keen next time

[tddmonkey]

One tip I can give you - the compiler is your friend, listen to it 🙂