UnimplementedError Flutter WEB

[danieramiz]

I'm trying to run the example project and I'm getting this error:

══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
The following UnimplementedError was thrown during a scheduler callback:
UnimplementedError

When the exception was thrown, this was the stack:
package:dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 196:49  throw_
package:build_web_compilers/lib/_engine/engine/shader.dart 51:5                       createPaintStyle
package:build_web_compilers/lib/_engine/engine/bitmap_canvas.dart 212:23              [_applyPaint]
package:build_web_compilers/lib/_engine/engine/bitmap_canvas.dart 343:5               drawPath
package:build_web_compilers/lib/_engine/engine/surface/recording_canvas.dart 990:11   apply
package:build_web_compilers/lib/_engine/engine/surface/recording_canvas.dart 78:18    apply
package:build_web_compilers/lib/_engine/engine/surface/picture.dart 253:35            paintCallback
package:build_web_compilers/lib/_engine/engine/surface/surface.dart 71:14             commitScene
package:build_web_compilers/lib/_engine/engine/surface/scene_builder.dart 520:5       build
package:flutter/src/rendering/layer.dart 801:35                                       buildScene
package:flutter/src/rendering/view.dart 230:36                                        compositeFrame
package:flutter/src/rendering/binding.dart 405:18                                     drawFrame
package:flutter/src/widgets/binding.dart 797:13                                       drawFrame
package:flutter/src/rendering/binding.dart 283:5                                      [_handlePersistentFrameCallback]
package:flutter/src/scheduler/binding.dart 1109:15                                    [_invokeFrameCallback]
package:flutter/src/scheduler/binding.dart 1048:9                                     handleDrawFrame
package:flutter/src/scheduler/binding.dart 857:7                                      <fn>
package:dart-sdk/lib/_internal/js_dev_runtime/private/isolate_helper.dart 50:19       internalCallback
════════════════════════════════════════════════════════════════════════════════════════════════════
Another exception was thrown: NoSuchMethodError: invalid member on null: 'doesFitBounds'
Another exception was thrown: Assertion failed: org-dartlang-sdk:///flutter_web_sdk/lib/_engine/engine/surface/scene_builder.dart:267:12
Another exception was thrown: Assertion failed: org-dartlang-sdk:///flutter_web_sdk/lib/_engine/engine/surface/scene_builder.dart:267:12
Another exception was thrown: Assertion failed: org-dartlang-sdk:///flutter_web_sdk/lib/_engine/engine/surface/scene_builder.dart:267:12
Another exception was thrown: Assertion failed: org-dartlang-sdk:///flutter_web_sdk/lib/_engine/engine/surface/scene_builder.dart:267:12

my flutter doctor:

Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel beta, v1.14.6, on Mac OS X 10.15.3 19D76, locale es-419)
[✓] Android toolchain - develop for Android devices (Android SDK version 29.0.2)
[✓] Xcode - develop for iOS and macOS (Xcode 11.3.1)
[✓] Chrome - develop for the web
[✓] Android Studio (version 3.5)
[✓] VS Code (version 1.43.0)
[✓] Connected device (2 available)

• No issues found!

[matthewfx]

I haven't tried it on the Flutter WEB... Does it work for you on mobile?

[shadowdogg]

@matthewfx I think the issue is, it has the flag of 'web' in your plugin. This makes everyone think its compatible. I have spent the last 4 hours trying to see what I can do myself. I love the idea of the plugin though, great job if it works on mobile.

[matthewfx]

Hi, I am sorry for your trouble. I will remove the flag in a next release - it's probably in every new Flutter project set like it by default and I wasn't aware. It works on mobile and if I have time one day I will try to check what's wrong with the web.

[JErazo7]

Is web support already enabled?

[kkujawinski]

I found the root of the problem. It is SweepGradient. I made a fix in which for web channel LinearGradient is used.

Pull request: #35

One can use mine workaround by adding it to pubspec.yaml:

  sleek_circular_slider:
    git:
      # PR with my fix https://github.com/matthewfx/sleek_circular_slider/pull/35
      url: git://github.com/kkujawinski/sleek_circular_slider

[matthewfx]

@kkujawinski fixed the issue - thank you!