F:\work\examples\keyboard_event>flutter doctor -v
[√] Flutter (Channel master, v1.10.2-pre.36, on Microsoft Windows [Version 10.0.17134.1006], locale en-IN)
• Flutter version 1.10.2-pre.36 at C:\flutter
• Framework revision 32c946f (4 days ago), 2019-09-10 20:49:27 -0700
• Engine revision 7ea9884
• Dart version 2.5.0 (build 2.5.0-dev.4.0 be66176534)

[√] Android toolchain - develop for Android devices (Android SDK version 28.0.3)
• Android SDK at C:\Users\User\AppData\Local\Android\Sdk
• Android NDK location not configured (optional; useful for native profiling support)
• Platform android-28, build-tools 28.0.3
• ANDROID_HOME = C:\Users\User\AppData\Local\Android\Sdk
• ANDROID_SDK_ROOT = C:\Users\User\AppData\Local\Android\Sdk
• Java binary at: C:\Program Files\Android\Android Studio\jre\bin\java
• Java version OpenJDK Runtime Environment (build 1.8.0_202-release-1483-b03)
• All Android licenses accepted.

[√] Chrome - develop for the web
• Chrome at C:\Program Files (x86)\Google\Chrome\Application\chrome.exe

[☠] Visual Studio - develop for Windows (the doctor check crashed)
X Due to an error, the doctor check did not complete. If the error message below is not helpful, please let us know about this
issue at https://github.com/flutter/flutter/issues.
X type 'String' is not a subtype of type 'bool'
• #0 VisualStudio.isPrerelease (package:flutter_tools/src/windows/visual_studio.dart:40:7)
#1 VisualStudioValidator.validate (package:flutter_tools/src/windows/visual_studio_validator.dart:33:24)

#2 asyncGuard. (package:flutter_tools/src/base/async_guard.dart:111:32)

#3 _rootRun (dart:async/zone.dart:1124:13)
#4 _CustomZone.run (dart:async/zone.dart:1021:19)
#5 _runZoned (dart:async/zone.dart:1516:10)
#6 runZoned (dart:async/zone.dart:1500:12)
#7 asyncGuard (package:flutter_tools/src/base/async_guard.dart:109:3)
#8 Doctor.startValidatorTasks (package:flutter_tools/src/doctor.dart:151:11)
#9 Doctor.diagnose (package:flutter_tools/src/doctor.dart:244:41)
#10 _AsyncAwaitCompleter.start (dart:async-patch/async_patch.dart:43:6)
#11 Doctor.diagnose (package:flutter_tools/src/doctor.dart:234:24)
#12 DoctorCommand.runCommand (package:flutter_tools/src/commands/doctor.dart:59:39)
#13 _AsyncAwaitCompleter.start (dart:async-patch/async_patch.dart:43:6)
#14 DoctorCommand.runCommand (package:flutter_tools/src/commands/doctor.dart:45:42)
#15 FlutterCommand.verifyThenRunCommand (package:flutter_tools/src/runner/flutter_command.dart:490:18)
#16 _asyncThenWrapperHelper. (dart:async-patch/async_patch.dart:71:64)
#17 _rootRunUnary (dart:async/zone.dart:1132:38)
#18 _CustomZone.runUnary (dart:async/zone.dart:1029:19)
#19 _FutureListener.handleValue (dart:async/future_impl.dart:137:18)
#20 Future._propagateToListeners.handleValueCallback (dart:async/future_impl.dart:678:45)
#21 Future._propagateToListeners (dart:async/future_impl.dart:707:32)
#22 Future._completeWithValue (dart:async/future_impl.dart:522:5)
#23 Future._asyncComplete. (dart:async/future_impl.dart:552:7)
#24 _rootRun (dart:async/zone.dart:1124:13)
#25 _CustomZone.run (dart:async/zone.dart:1021:19)
#26 _CustomZone.runGuarded (dart:async/zone.dart:923:7)
#27 _CustomZone.bindCallbackGuarded. (dart:async/zone.dart:963:23)
#28 _microtaskLoop (dart:async/schedule_microtask.dart:41:21)
#29 _startMicrotaskLoop (dart:async/schedule_microtask.dart:50:5)
#30 _runPendingImmediateCallback (dart:isolate-patch/isolate_patch.dart:116:13)
#31 _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:173:5)

[√] Android Studio (version 3.5)
• Android Studio at C:\Program Files\Android\Android Studio
• Flutter plugin version 38.2.3
• Dart plugin version 191.8423
• Java version OpenJDK Runtime Environment (build 1.8.0_202-release-1483-b03)

[√] IntelliJ IDEA Community Edition (version 2019.1)
• IntelliJ at C:\Program Files\JetBrains\IntelliJ IDEA Community Edition 2019.1.1
• Flutter plugin version 36.0.4
• Dart plugin version 191.7830

[√] VS Code, 64-bit edition (version 1.38.0)
• VS Code at C:\Program Files\Microsoft VS Code
• Flutter extension version 3.4.1

[√] Connected device (3 available)
• Windows • Windows • windows-x64 • Microsoft Windows [Version 10.0.17134.1006]
• Chrome • chrome • web-javascript • Google Chrome 77.0.3865.75
• Server • web • web-javascript • Flutter Tools

! Doctor found issues in 1 category.

F:\work\examples\keyboard_event>