//main class
 Widget build(BuildContext context) {
    return MultiBlocProvider(

      providers: [
        .....
        BlocProvider<AuthenticationBloc>(
            create: (BuildContext context){
              return AuthenticationBloc(userRepository: userRepository);

            }
        ),
        BlocProvider<CartBloc>(
          create: (BuildContext context){
            return CartBloc(
              cartRepository: cartRepository,
              userBloc: BlocProvider.of<UserBloc>(context)
            );
          },

        )
   ],
       child: MaterialApp(
          routes: {
            "/pricelist" : (context) => PricelistPage(),
          }
}