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The class 'FirebaseAnalytics' doesn't have an unnamed constructor

I would like to use firebase analytics but keep getting this error, I upgrade and cleaned but still has the same error. any idea how I can solve it? thanks

static FirebaseAnalytics analytics = FirebaseAnalytics(); FirebaseAnalytics is underlined

I solve it by removing the parentheses and adding .instance .

static FirebaseAnalytics analytics = FirebaseAnalytics.instance;

see documentation . Thanks

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