小编Big*_*ong的帖子

我最近尝试构建我的 flutter 应用程序的网络版本。这是我第一次这样做。经过许多挑战和错误，所有问题都通过各种堆栈帖子解决，这是我当前面临的错误：

Error: \xe2\x95\x90\xe2\x95\x90\xe2\x95\xa1 EXCEPTION CAUGHT BY SCHEDULER LIBRARY \xe2\x95\x9e\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\nThe following UnimplementedError was thrown during a scheduler\ncallback:\nUnimplementedError\n\nWhen the exception was thrown, this was the stack:\nC:/b/s/w/ir/cache/builder/src/out/host_debug/dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 216:49  throw_\nC:/b/s/w/ir/cache/builder/src/out/host_debug/flutter_web_sdk/lib/_engine/engine/html/scene_builder.dart 231:5              pushShaderMask\npackages/flutter/src/rendering/layer.dart 1812:26                                                                          addToScene\npackages/flutter/src/rendering/layer.dart 440:5                                                                            [_addToSceneWithRetainedRendering]\npackages/flutter/src/rendering/layer.dart 1027:14                                                                          addChildrenToScene\npackages/flutter/src/rendering/layer.dart 1013:5                                                                           addToScene\npackages/flutter/src/rendering/layer.dart 440:5                                                                            [_addToSceneWithRetainedRendering]\npackages/flutter/src/rendering/layer.dart 1027:14                                                                          addChildrenToScene\npackages/flutter/src/rendering/layer.dart 1164:5                                                                           addToScene\npackages/flutter/src/rendering/layer.dart 440:5                                                                            [_addToSceneWithRetainedRendering]\npackages/flutter/src/rendering/layer.dart 1027:14                                                                          addChildrenToScene\npackages/flutter/src/rendering/layer.dart 1164:5                                                                           addToScene\npackages/flutter/src/rendering/layer.dart 440:5                                                                            [_addToSceneWithRetainedRendering]\npackages/flutter/src/rendering/layer.dart 1027:14                                                                          addChildrenToScene\npackages/flutter/src/rendering/layer.dart 1999:5                                                                           addToScene\npackages/flutter/src/rendering/layer.dart 440:5                                                                            [_addToSceneWithRetainedRendering]\npackages/flutter/src/rendering/layer.dart 1027:14                                                                          addChildrenToScene\npackages/flutter/src/rendering/layer.dart 1164:5                                                                           addToScene\npackages/flutter/src/rendering/layer.dart 440:5                                                                            [_addToSceneWithRetainedRendering]\npackages/flutter/src/rendering/layer.dart 1027:14                                                                          addChildrenToScene\npackages/flutter/src/rendering/layer.dart 1164:5                                                                           addToScene\npackages/flutter/src/rendering/layer.dart 440:5                                                                            [_addToSceneWithRetainedRendering]\npackages/flutter/src/rendering/layer.dart 1027:14                                                                          addChildrenToScene\npackages/flutter/src/rendering/layer.dart 1609:5                                                                           addToScene\npackages/flutter/src/rendering/layer.dart 765:5                                                                            buildScene\npackages/flutter/src/rendering/view.dart 231:30                                                                            compositeFrame\npackages/flutter/src/rendering/binding.dart 458:18 …