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Why is the type '($someObject$) => $someWidget$' not a subtype of type '(dynamic) => Widget'? – Flutter

I have an flutter app that throws this error, at a specific action in the application: ======== Exception caught by widgets library ======================================================= The following _TypeError was thrown building DataFetcher<CompleteVocabularyCollection>(dirty, state: _DataFetcherState<CompleteVocabularyCollection>#da61b): type '(CompleteVocabularyCollection) => DetailsDisplay' is not a subtype…

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Exception has occurred. _CastError (Null check operator used on a null value) – Flutter

How is Null Safety in this code class EditProduct extends StatelessWidget { final _formKey = GlobalKey<FormState>(); The line of code with the problem: _formKey.currentState!.validate() ElevatedButton( onPressed: () { if (_formKey.currentState!.validate()) { updateProduct().then((value) { Navigator.push( context, MaterialPageRoute( builder: (context) => HomePage()));…

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