Extension not working

Why extension not working in my playground ? , I´m reading the swift book , and I with extension , but when I try to do a extension to a class , the compiler said to me , that declaration is only valid at file scope ,what that means ? thank you for your time

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KalitaKaliza
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Protocols cannot be nested and file scope is effective even in non-Playground projects in Swift.

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OOPer
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Please show your code. As the error is about file scope, you should better show in which file the code exists.

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And i have a similar problem with protocol , but here said to me : cannot be nested

Maybe the problem is that i´m in PlayGround ?? thanks

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KalitaKaliza
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https://s8.postimg.cc/8t69rrwyd/Captura_de_pantalla_2018-07-16_a_las_19.44.50.png

https://s8.postimg.cc/orezi2r85/Captura_de_pantalla_2018-07-16_a_las_19.42.43.png

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KalitaKaliza
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Protocols cannot be nested and file scope is effective even in non-Playground projects in Swift.

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OOPer
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