Issue 1:
If you're in one of the demo app directories when you run flutter analyze --flutter-repo, it will include that directory twice (once because of the crawl, once because of the current directory having a package), which seems to result in duplicate errors sometimes? (The latter might be an analyzer bug.)

Issue 2:
command

flutter build apk

exception

FormatException: FormatException: Bad UTF-8 encoding 0xa8 (at offset 165)

#0 _Utf8Decoder.convert (dart:convert/utf.dart:568:13)
#1 _Utf8ConversionSink.addSlice (dart:convert/string_conversion.dart:345:14)
#2 _Utf8ConversionSink.add (dart:convert/string_conversion.dart:341:5)
#3 _ConverterStreamEventSink.add (dart:convert/chunked_conversion.dart:86:18)
#4 _SinkTransformerStreamSubscription._handleData (dart:async/stream_transformers.dart:120:24)
#5 _rootRunUnary (dart:async/zone.dart:1132:38)
#6 _CustomZone.runUnary (dart:async/zone.dart:1029:19)
#7 _CustomZone.runUnaryGuarded (dart:async/zone.dart:931:7)
#8 _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:336:11)
#9 _BufferingStreamSubscription._add (dart:async/stream_impl.dart:263:7)
#10 _SyncStreamController._sendData (dart:async/stream_controller.dart:763:19)
#11 _StreamController._add (dart:async/stream_controller.dart:639:7)
#12 _StreamController.add (dart:async/stream_controller.dart:585:5)
#13 _Socket._onData (dart:io/runtime/binsocket_patch.dart:1721:41)
#14 _rootRunUnary (dart:async/zone.dart:1136:13)
#15 _CustomZone.runUnary (dart:async/zone.dart:1029:19)
#16 _CustomZone.runUnaryGuarded (dart:async/zone.dart:931:7)
#17 _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:336:11)
#18 _BufferingStreamSubscription._add (dart:async/stream_impl.dart:263:7)
#19 _SyncStreamController._sendData (dart:async/stream_controller.dart:763:19)
#20 _StreamController._add (dart:async/stream_controller.dart:639:7)
#21 _StreamController.add (dart:async/stream_controller.dart:585:5)
#22 new _RawSocket.<anonymous closure> (dart:io/runtime/binsocket_patch.dart:1283:33)
#23 _NativeSocket.issueReadEvent.issue (dart:io/runtime/binsocket_patch.dart:826:14)
#24 _microtaskLoop (dart:async/schedule_microtask.dart:41:21)
#25 _startMicrotaskLoop (dart:async/schedule_microtask.dart:50:5)
#26 _runPendingImmediateCallback (dart:isolate/runtime/libisolate_patch.dart:115:13)
#27 _RawReceivePortImpl._handleMessage (dart:isolate/runtime/libisolate_patch.dart:172:5)

flutter doctor

�[32m[✓]�[39m Flutter (Channel beta, v1.0.0, on Microsoft Windows [Version 10.0.17134.407], locale zh-CN)
�[32m•�[39m Flutter version 1.0.0 at E:\flutter\flutter_windows_v0.3.2-beta\flutter
�[32m•�[39m Framework revision 5391447fae (7 days ago), 2018-11-29 19:41:26 -0800
�[32m•�[39m Engine revision 7375a0f414
�[32m•�[39m Dart version 2.1.0 (build 2.1.0-dev.9.4 f9ebf21297)

�[32m[✓]�[39m Android toolchain - develop for Android devices (Android SDK 28.0.3)
�[32m•�[39m Android SDK at C:\Users\sinosoft\AppData\Local\Android\Sdk
�[32m•�[39m Android NDK location not configured (optional; useful for native profiling support)
�[32m•�[39m Platform android-28, build-tools 28.0.3
�[32m•�[39m ANDROID_HOME = C:\Users\sinosoft\AppData\Local\Android\Sdk
�[32m•�[39m Java binary at: C:\Program Files\Android\Android Studio\jre\bin\java
�[32m•�[39m Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1136-b06)
�[32m•�[39m All Android licenses accepted.

�[32m[✓]�[39m Android Studio (version 3.2)
�[32m•�[39m Android Studio at C:\Program Files\Android\Android Studio
�[31m✗�[39m Flutter plugin not installed; this adds Flutter specific functionality.
�[31m✗�[39m Dart plugin not installed; this adds Dart specific functionality.
�[32m•�[39m Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1136-b06)

�[33m[!]�[39m IntelliJ IDEA Ultimate Edition (version 2018.3)
�[32m•�[39m IntelliJ at C:\Program Files\JetBrains\IntelliJ IDEA 2018.3
�[31m✗�[39m Flutter plugin not installed; this adds Flutter specific functionality.
�[31m✗�[39m Dart plugin not installed; this adds Dart specific functionality.
�[32m•�[39m For information about installing plugins, see
https://flutter.io/intellij-setup/#installing-the-plugins

�[32m[✓]�[39m VS Code, 64-bit edition (version 1.29.1)
�[32m•�[39m VS Code at C:\Program Files\Microsoft VS Code
�[32m•�[39m Flutter extension version 2.21.0

�[32m[✓]�[39m Connected device (1 available)
�[32m•�[39m BKL AL00 • RKKDU18104007058 • android-arm64 • Android 9 (API 28)

�[33m!�[39m Doctor found issues in 1 category.