Flutter: Target kernel_snapshot failed - flutter

Question

I have updated to the latest flutter update. When I want to start the project, it returns an error. The project depends on several repositories and I don't know if that is why. I have tried multiple solutions but they do not solve the error. Hope someone can help me. thanks.
I updated flutter stable to the latest version:
Upgrading Flutter from /Users/domingo/flutter...
Updating cf37c2cd0..27321ebba
24 files changed, 651 insertions(+), 218 deletions(-)
Flutter is already up to date on channel stable
Flutter 1.12.13+hotfix.5 • channel stable • https://github.com/flutter/flutter.git
Framework • revision 27321ebbad (2 days ago) • 2019-12-10 18:15:01 -0800
Engine • revision 2994f7e1e6
Tools • Dart 2.7.0
Debug Terminal Complete:
https://pastebin.com/2PwktnGT
/Users/domingo/StudioProjects/faycancrm/.dart_tool/flutter_build/e61e4110ac7bd4b7b74855b2fc423272/app.di
ll --depfile
/Users/domingo/StudioProjects/faycancrm/.dart_tool/flutter_build/e61e4110ac7bd4b7b74855b2fc423272/kernel
_snapshot.d package:faycancrm/main.dart
[+2401 ms] [+2478 ms]
[ +1 ms] Compiler message:
[ ] [ +3 ms]
../../flutter/.pub-cache/hosted/pub.dartlang.org/zefyr-0.8.0/lib/src/widgets/input.dart:11:7: Error: The
non-abstract class 'InputConnectionController' is missing implementations for these members:
[ ] [ ] - TextInputClient.connectionClosed
[ ] [ ] Try to either
[ ] [ ] - provide an implementation,
[ ] [ ] - inherit an implementation from a superclass or mixin,
[ ] [ ] - mark the class as abstract, or
[ ] [ ] - provide a 'noSuchMethod' implementation.
[ ] [ ] class InputConnectionController implements TextInputClient {
[ ] [ ] ^^^^^^^^^^^^^^^^^^^^^^^^^
[ ] [ ] ../../flutter/packages/flutter/lib/src/services/text_input.dart:661:8: Context:
'TextInputClient.connectionClosed' is defined here.
[ ] [ ] void connectionClosed();
[ ] [ ] ^^^^^^^^^^^^^^^^
[ +391 ms] [ +402 ms]
../../flutter/.pub-cache/hosted/pub.dartlang.org/cached_network_image-1.1.3/lib/src/cached_network_image
_provider.dart:42:24: Error: The method 'CachedNetworkImageProvider.load' has fewer positional arguments
than those of overridden method 'ImageProvider.load'.
[ ] [ ] ImageStreamCompleter load(CachedNetworkImageProvider key) {
[ ] [ ] ^
[ ] [ ] ../../flutter/packages/flutter/lib/src/painting/image_provider.dart:403:24:
Context: This is the overridden method ('load').
[ ] [ ] ImageStreamCompleter load(T key, DecoderCallback decode);
[ ] [ ] ^
[+8796 ms] [+8774 ms] Persisting file store
[ ] [ +19 ms] Done persisting file store
[ ] [ +1 ms] Target kernel_snapshot failed: Exception: Errors during snapshot creation: null
[ +97 ms] [ +11 ms] "flutter assemble" took 13.771ms.
[ ] build failed.
[ ] #0 throwToolExit (package:flutter_tools/src/base/common.dart:28:3)
[ ] #1 AssembleCommand.runCommand (package:flutter_tools/src/commands/assemble.dart:183:7)
[ ] <asynchronous suspension>
[ ] #2 FlutterCommand.verifyThenRunCommand
(package:flutter_tools/src/runner/flutter_command.dart:615:18)
[ ] <asynchronous suspension>
[ ] #3 FlutterCommand.run.<anonymous closure>
(package:flutter_tools/src/runner/flutter_command.dart:515:33)
[ +1 ms] <asynchronous suspension>
[ ] #4 AppContext.run.<anonymous closure>
(package:flutter_tools/src/base/context.dart:146:29)
[ ] #5 _rootRun (dart:async/zone.dart:1126:13)
[ ] #6 _CustomZone.run (dart:async/zone.dart:1023:19)
[ ] #7 _runZoned (dart:async/zone.dart:1518:10)
[ ] #8 runZoned (dart:async/zone.dart:1465:12)
[ ] #9 AppContext.run (package:flutter_tools/src/base/context.dart:145:18)
[ ] #10 FlutterCommand.run (package:flutter_tools/src/runner/flutter_command.dart:505:20)
[ ] #11 CommandRunner.runCommand (package:args/command_runner.dart:197:27)
[ ] #12 FlutterCommandRunner.runCommand.<anonymous closure>
(package:flutter_tools/src/runner/flutter_command_runner.dart:413:21)
[ +16 ms] <asynchronous suspension>
[ ] #13 AppContext.run.<anonymous closure>
(package:flutter_tools/src/base/context.dart:146:29)
[ ] #14 _rootRun (dart:async/zone.dart:1126:13)
[ ] #15 _CustomZone.run (dart:async/zone.dart:1023:19)
[ +1 ms] #16 _runZoned (dart:async/zone.dart:1518:10)
[ ] #17 runZoned (dart:async/zone.dart:1465:12)
[ ] #18 AppContext.run (package:flutter_tools/src/base/context.dart:145:18)
[ ] #19 FlutterCommandRunner.runCommand
(package:flutter_tools/src/runner/flutter_command_runner.dart:364:19)
[ ] #20 CommandRunner.run.<anonymous closure> (package:args/command_runner.dart:112:25)
[ ] #21 new Future.sync (dart:async/future.dart:224:31)
[ ] #22 CommandRunner.run (package:args/command_runner.dart:112:14)
[ ] #23 FlutterCommandRunner.run
(package:flutter_tools/src/runner/flutter_command_runner.dart:250:18)
[ ] #24 run.<anonymous closure>.<anonymous closure> (package:flutter_tools/runner.dart:63:22)
[ ] #25 _rootRun (dart:async/zone.dart:1126:13)
[ ] #26 _CustomZone.run (dart:async/zone.dart:1023:19)
[ ] #27 _runZoned (dart:async/zone.dart:1518:10)
[ ] #28 runZoned (dart:async/zone.dart:1502:12)
[ ] #29 run.<anonymous closure> (package:flutter_tools/runner.dart:61:18)
[ ] <asynchronous suspension>
[ ] #30 AppContext.run.<anonymous closure>
(package:flutter_tools/src/base/context.dart:146:29)
[ ] #31 _rootRun (dart:async/zone.dart:1126:13)
[ ] #32 _CustomZone.run (dart:async/zone.dart:1023:19)
[ ] #33 _runZoned (dart:async/zone.dart:1518:10)
[ ] #34 runZoned (dart:async/zone.dart:1465:12)
[ ] #35 AppContext.run (package:flutter_tools/src/base/context.dart:145:18)
[ ] #36 runInContext (package:flutter_tools/src/context_runner.dart:64:24)
[ ] #37 run (package:flutter_tools/runner.dart:50:10)
[ ] #38 main (package:flutter_tools/executable.dart:65:9)
[ ] #39 main
(file:///Users/domingo/flutter/packages/flutter_tools/bin/flutter_tools.dart:8:3)
[ +3 ms] #40 _startIsolate.<anonymous closure> (dart:isolate-patch/isolate_patch.dart:305:32)
[ ] #41 _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:174:12)
[ ] FAILURE: Build failed with an exception.
[ ] * Where:
[ ] Script '/Users/domingo/flutter/packages/flutter_tools/gradle/flutter.gradle' line: 780
[ ] * What went wrong:
[ ] Execution failed for task ':app:compileFlutterBuildDebug'.
[ ] > Process 'command '/Users/domingo/flutter/bin/flutter'' finished with non-zero exit value 1
[ +3 ms] * Try:
[ ] Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get
more log output. Run with --scan to get full insights.
[ +5 ms] * Get more help at https://help.gradle.org
[ ] BUILD FAILED in 17s
[ ] > Task :app:compileFlutterBuildDebug FAILED
[ ] 1 actionable task: 1 executed
[ +471 ms] Running Gradle task 'assembleDebug'... (completed in 19,2s)
[ +3 ms] The built failed likely due to AndroidX incompatibilities in a plugin. The tool is about to
try using
Jetfier to solve the incompatibility.
[ +15 ms] ✏️ Creating `android/settings_aar.gradle`...
[ +4 ms] ✏️ Creating `android/settings_aar.gradle`... (completed in 2ms)
[ ] ✓ `android/settings_aar.gradle` created successfully.
[ +3 ms] Building plugin audioplayers...
[ +9 ms] Running Gradle task 'assembleAarRelease'...
[ +2 ms] set `android.enableR8=true` in gradle.properties
[ +26 ms] Using gradle from

Answer 1

It looks like the interface for TextInputClient has changed and Zefyr hasn't been updated to fully implement the new methods (for example, it looks like it's missing an implementation for connectionClosed, but the Zefyr source doesn't have an implementation).
Unfortunately, there's not much you can do about this other than:
File an issue against the Zefyr repo on GitHub and hope the author gets around to publishing a fix
Fork Zefyr and depend on a local copy on your machine after you've implemented the missing methods
Downgrade your Flutter version to the last version which Zefyr works on
Find another plugin which provides similar functionality