Step 5 and Step 6 appear to be broken in the codelab.

[robertflesch]

Line 142 will not compile of step 6 will not compile.
Line 135 of step 5.

itemBuilder: (_, DataSnapshot snapshot, Animation<double> animation) {
                return new ChatMessage(
                    snapshot: snapshot,
                    animation: animation
                );
              },

error: The argument type '(BuildContext, DataSnapshot, Animation<double>) → ChatMessage' can't be assigned to the parameter type '(BuildContext, DataSnapshot, Animation<double>, int) → Widget'. (argument_type_not_assignable at [clearfocussports] lib\main.dart:142)

FYI I am using community edition for flutter.

[√] Flutter (Channel beta, v0.1.5, on Microsoft Windows [Version 10.0.16299.248], locale en-US)
[√] Android toolchain - develop for Android devices (Android SDK 27.0.3)
[√] Android Studio (version 3.0)
[√] IntelliJ IDEA Community Edition (version 2017.3)
[!] IntelliJ IDEA Ultimate Edition (version 2016.3)
    X Flutter plugin not installed; this adds Flutter specific functionality.
    X Dart plugin not installed; this adds Dart specific functionality.
    X This install is older than the minimum recommended version of 2017.1.0.
[√] Connected devices (1 available)

! Doctor found issues in 1 category.
PS C:\Users\TheBeast\IdeaProjects\clearfocussports> flutter doctor -v
[√] Flutter (Channel beta, v0.1.5, on Microsoft Windows [Version 10.0.16299.248], locale en-US)
    • Flutter version 0.1.5 at E:\devTools\flutter
    • Framework revision 3ea4d06340 (2 weeks ago), 2018-02-22 11:12:39 -0800
    • Engine revision ead227f118
    • Dart version 2.0.0-dev.28.0.flutter-0b4f01f759

[√] Android toolchain - develop for Android devices (Android SDK 27.0.3)
    • Android SDK at C:\Users\TheBeast\AppData\Local\Android\Sdk
    • Android NDK location not configured (optional; useful for native profiling support)
    • Platform android-27, build-tools 27.0.3
    • ANDROID_HOME = C:\Users\TheBeast\AppData\Local\Android\Sdk
    • Java binary at: E:\Program Files\Android\Android Studio\jre\bin\java
    • Java version OpenJDK Runtime Environment (build 1.8.0_152-release-915-b01)

[√] Android Studio (version 3.0)
    • Android Studio at E:\Program Files\Android\Android Studio
    • Java version OpenJDK Runtime Environment (build 1.8.0_152-release-915-b01)

[√] IntelliJ IDEA Community Edition (version 2017.3)
    • Flutter plugin version 22.2.2
    • Dart plugin version 173.4548.30

[!] IntelliJ IDEA Ultimate Edition (version 2016.3)
    X Flutter plugin not installed; this adds Flutter specific functionality.
    X Dart plugin not installed; this adds Dart specific functionality.
    • For information about installing plugins, see
      https://flutter.io/intellij-setup/#installing-the-plugins
    X This install is older than the minimum recommended version of 2017.1.0.

[√] Connected devices (1 available)
    • Moto G 4 • ZY223TFZPN • android-arm • Android 7.0 (API 24)

! Doctor found issues in 1 category.

[robertflesch]

Find found fix for it. - Was missing , int index

itemBuilder: (_, DataSnapshot snapshot, Animation<double> animation, int index ) {
                return new ChatMessage(
                    snapshot: snapshot,
                    animation: animation
                );
              },

[Hixie]

cc @Sfshaza

[Sfshaza]

This is for the obsolete Firebase + Flutter codelab. The Chat app has been replaced by a Baby Naming vote app. Closing.

[github-actions]

This thread has been automatically locked since there has not been any recent activity after it was closed. If you are still experiencing a similar issue, please open a new bug, including the output of flutter doctor -v and a minimal reproduction of the issue.