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GridView with Flutter and Firestore

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I`m trying to make a simple GridView from a cloud firestore record. I've followed a lot of video tutorials but without success. Here's the code:

import 'package:flutter/material.dart';
import 'package:cloud_firestore/cloud_firestore.dart';

class EventList extends StatefulWidget {
 EventListState createState() => new EventListState();

class EventListState extends State<EventList> {
  Widget build(BuildContext context) {
    return StreamBuilder(
      stream: Firestore.instance.collection('events_flutter').snapshots(),
  builder: (BuildContext context, DocumentSnapshot snapshot) {
    if (!snapshot.hasData) {
      return Center(child: const Text('Loading events...'));
    return GridView.builder(
          SliverGridDelegateWithFixedCrossAxisCount(crossAxisCount: 2),
      itemBuilder: (BuildContext context, int index) {
        return Text(snapshot['event_name']);

And this is the error message when hovering on "builder: (BuildContext context, DocumentSnapshot snapshot)". Could anybody help me understand what is going on?

Thanks a lot.

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