The method 'bloc' isn't defined for the type 'BuildContext'

After v6.1.0, both context.bloc and context.repository are deprecated in favor of context.read and context.watch. checkout the migration guide for more information.

I think that the below code that you used means that will use bloc from the parent widget defined with BlocProvider. But because it seems that you have a bloc instance in this widget you just use that instance.

// with extensionscontext.bloc<BlocA>();// without extensionsBlocProvider.of<BlocA>(context)

Because you used movieBloc at the MovieSuccessState state,I think you can just refer isFetching and add method using movieBloc instead of context.bloc<MovieBloc>().

return GridView.builder(                  controller: _scrollController                    ..addListener(() {                      if (_scrollController.offset ==                          _scrollController.position.maxScrollExtent) {                        //context.bloc<MovieBloc>()                        //  ..isFetching = true                        //  ..add(Fetch());                        movieBloc.isFetching = true;                        movieBloc.add(Fetch());                      }                    }),