Undefined class 'StreamSubscription'. Try changing the name to the name of an existing class

Undefined class 'StreamSubscription'. Try changing the name to the name of an existing class, or creating a class with the name 'StreamSubscription'.

StreamSubscription 클래스를 사용하려는 데 아래와 같은 에러를 발생시키고선 실행을 하지 못하게 하고 ...

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A problem occurred evaluating root project ... (0)	2020.05.15
Missing case clause for 'active'.Try adding a case clause for the missing constant, or adding a default clause. (0)	2020.05.15
This requires the 'extension-methods' experiment to be enabled. (0)	2020.05.15

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