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}
/>