Launching lib\main.dart on 16th in debug mode...
Initializing gradle...
Resolving dependencies...
Running Gradle task 'assembleDebug'...
D8: Program type already present: com.amap.api.fence.DistrictItem
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':app:transformDexArchiveWithExternalLibsDexMergerForDebug'.
> com.android.builder.dexing.DexArchiveMergerException: Error while merging dex archives: ..\build\app\intermediates\transforms\dexBuilder\debug\0.jar,
..\build\app\intermediates\transforms\dexBuilder\debug\1.jar, ..\build\app\intermediates\transforms\dexBuilder\debug\2.jar,
..\build\app\intermediates\transforms\dexBuilder\debug\3.jar, ..\build\app\intermediates\transforms\dexBuilder\debug\8.jar,
..\build\app\intermediates\transforms\dexBuilder\debug\9.jar, ..\build\app\intermediates\transforms\dexBuilder\debug\10.jar,
..\build\app\intermediates\transforms\dexBuilder\debug\11.jar, ..\build\app\intermediates\transforms\dexBuilder\debug\12.jar,
..\build\app\intermediates\transforms\dexBuilder\debug\13.jar, ..\build\app\intermediates\transforms\dexBuilder\debug\14.jar,
..\build\app\intermediates\transforms\dexBuilder\debug\15.jar, ..\build\app\intermediates\transforms\dexBuilder\debug\16.jar,
..\build\app\intermediates\transforms\dexBuilder\debug\17.jar, ..\build\app\intermediates\transforms\dexBuilder\debug\18.jar,
..\build\app\intermediates\transforms\dexBuilder\debug\19.jar, ..\build\app\intermediates\transforms\dexBuilder\debug\20.jar,
..\build\app\intermediates\transforms\dexBuilder\debug\21.jar, ..\build\app\intermediates\transforms\dexBuilder\debug\22.jar,
..\build\app\intermediates\transforms\dexBuilder\debug\23.jar, ..\build\app\intermediates\transforms\dexBuilder\debug\24.jar,
..\build\app\intermediates\transforms\dexBuilder\debug\25.jar, ..\build\app\intermediates\transforms\dexBuilder\debug\26.jar,
..\build\app\intermediates\transforms\dexBuilder\debug\27.jar, ..\build\app\intermediates\transforms\dexBuilder\debug\28.jar,
..\build\app\intermediates\transforms\dexBuilder\debug\29.jar, ..\build\app\intermediates\transforms\dexBuilder\debug\30.jar,
..\build\app\intermediates\transforms\dexBuilder\debug\31.jar, ..\build\app\intermediates\transforms\dexBuilder\debug\32.jar,
..\build\app\intermediates\transforms\dexBuilder\debug\33.jar, ..\build\app\intermediates\transforms\dexBuilder\debug\34.jar,
..\build\app\intermediates\transforms\dexBuilder\debug\35.jar, ..\build\app\intermediates\transforms\dexBuilder\debug\36.jar,
..\build\app\intermediates\transforms\dexBuilder\debug\37.jar, ..\build\app\intermediates\transforms\dexBuilder\debug\38.jar,
..\build\app\intermediates\transforms\dexBuilder\debug\39.jar, ..\build\app\intermediates\transforms\dexBuilder\debug\40.jar
Program type already present: com.amap.api.fence.DistrictItem
Learn how to resolve the issue at https://developer.android.com/studio/build/dependencies#duplicate_classes.
D:\flutter>flutter doctor -v
[√] Flutter (Channel stable, v1.9.1, on Microsoft Windows [Version 10.0.17134.1006], locale zh-CN)
• Flutter version 1.9.1 at D:\flutter
• Framework revision c382b8e990 (3 months ago), 2019-08-18 15:22:36 -0400
• Engine revision 5540684152
• Dart version 2.5.0
[√] Android toolchain - develop for Android devices (Android SDK version 28.0.3)
• Android SDK at D:\Android\sdk
• Android NDK location not configured (optional; useful for native profiling support)
• Platform android-29, build-tools 28.0.3
• Java binary at: D:\Android\AndroidStudio\jre\bin\java
• Java version OpenJDK Runtime Environment (build 1.8.0_202-release-1483-b03)
• All Android licenses accepted.
[√] Android Studio (version 3.5)
• Android Studio at D:\Android\AndroidStudio
• Flutter plugin version 41.1.2
• Dart plugin version 191.8593
• Java version OpenJDK Runtime Environment (build 1.8.0_202-release-1483-b03)