Flutter Problem : The method '[]' was called on null. Receiver: null Tried calling: [](0) , “Error”

Question

Hey Could anyone help me please, i'm having this type of error while trying to parse a json file from the internet

The following NoSuchMethodError was thrown building: The method '[]' was called on null. Receiver: null Tried calling:

When the exception was thrown, this was the stack: 
#0      Object.noSuchMethod (dart:core-patch/object_patch.dart:54:5)
#1      ProductsListPage._buildProductsListPage.<anonymous closure>.<anonymous closure> (package:wildkard/components/Boutique.dart:65:46)
#2      SliverChildBuilderDelegate.build (package:flutter/src/widgets/sliver.dart:455:22)
#3      SliverMultiBoxAdaptorElement._build (package:flutter/src/widgets/sliver.dart:1201:28)
#4      SliverMultiBoxAdaptorElement.createChild.<anonymous closure> (package:flutter/src/widgets/sliver.dart:1214:55)
...
====================================================================================================

My code:

  child: FutureBuilder<List<Product>>(
    future: _parseProductsFromResponse(95),
    builder: (context, snapshot) {
      switch (snapshot.connectionState) {
        case ConnectionState.active:

        case ConnectionState.waiting:
          return Center(child: CircularProgressIndicator());

        case ConnectionState.none:
          return Center(child: Text("Unable to connect right now"));

        case ConnectionState.done:
          return ListView.builder(
            itemCount: 8,
            itemBuilder: (context, index) {
              if (index == 0) {
                return _buildFilterWidgets(screenSize);
              } else if (index == 7) {
                return SizedBox(height: 12.0);
              } else if (index % 2 == 0) {
                return Container();
              } else {
                return ProductsListItem(
                  product1: snapshot.data[index - 1],
                  product2: snapshot.data[index],
                );
              }
            },
          );
      }
    },

Answer 1

Hey Could anyone help me please, i'm having this type of error while trying to parse a json file from the internet

The following NoSuchMethodError was thrown building: The method '[]' was called on null. Receiver: null Tried calling:

When the exception was thrown, this was the stack: 
#0      Object.noSuchMethod (dart:core-patch/object_patch.dart:54:5)
#1      ProductsListPage._buildProductsListPage.<anonymous closure>.<anonymous closure> (package:wildkard/components/Boutique.dart:65:46)
#2      SliverChildBuilderDelegate.build (package:flutter/src/widgets/sliver.dart:455:22)
#3      SliverMultiBoxAdaptorElement._build (package:flutter/src/widgets/sliver.dart:1201:28)
#4      SliverMultiBoxAdaptorElement.createChild.<anonymous closure> (package:flutter/src/widgets/sliver.dart:1214:55)
...
====================================================================================================

My code:

  child: FutureBuilder<List<Product>>(
    future: _parseProductsFromResponse(95),
    builder: (context, snapshot) {
      switch (snapshot.connectionState) {
        case ConnectionState.active:

        case ConnectionState.waiting:
          return Center(child: CircularProgressIndicator());

        case ConnectionState.none:
          return Center(child: Text("Unable to connect right now"));

        case ConnectionState.done:
          return ListView.builder(
            itemCount: 8,
            itemBuilder: (context, index) {
              if (index == 0) {
                return _buildFilterWidgets(screenSize);
              } else if (index == 7) {
                return SizedBox(height: 12.0);
              } else if (index % 2 == 0) {
                return Container();
              } else {
                return ProductsListItem(
                  product1: snapshot.data[index - 1],
                  product2: snapshot.data[index],
                );
              }
            },
          );
      }
    },