RangeError (index): Invalid value: Valid value range is empty: 0

Question

Widget build(context) {
    try{
      if (isFirst == true) {
        fetchImage();
        fetchCategories(context);
        isFirst = false;
      }
    }catch(Excepti         


        

Answer 1

Make sure specifying the length of the list of data. For example, if you're using ListView.builder give proper value to the attribute itemCount.

ListView.builder(
            itemCount: snapshot.data.length,
            itemBuilder: (ctx, index) {
              return WidgetItem();
            });