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android - Kotlin: Expecting a top level declaration

i'm super new to Kotlin and i don't see my problem anywhere so i guess it's trivial

i was following a tutorial and in it he wrote the following

var nullableName: String? = "Denis"
nullableName = null

and when i typed that in i got a compiler error saying "Expecting a top level declaration" but it didn't for him

i know if i type something like

var nullableName: String? = null

it works fine but i wanna understand why i'm getting that error


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