undefined is not a function(evaluating '_iterator[typeof Symbol === "function"?Symbol.iterator:"@@iterator"]()')

[7elven]

I found this error when replace with FlatList

<FlatList data={data} renderItem={_renderItem} onEndReached={this._onEndReached} initialNumToRender={5} keyExtractor={(item, index) => index.toString()} extraData={data} />