所以，我显然升级了我的pub依赖项，现在我不能再启动我的webApp了，会遇到很多错误。我尝试降级依赖项，但它没有帮助。
我的pubspec.yaml
name: division
description: A sample web application
dependencies:
browser: any
bwu_polymer_routing: any
core_elements: '>=0.1.1+2 <0.5.0'
di: '>=3.3.2 <5.0.0'
http: any
intl: any
js: any
polymer: any
unittest: 0.11.3
transformers:
- polymer:
entry_points:
- web/index.html
- di
我为每个自定义元素提供了许多错误消息：
[web] GET /index.html => division|web/index.html
[web] GET /packages/web_components/platform.js => web_components|lib/platform.js
[web] GET /packages/web_components/interop_support.js => web_components|lib/interop_support.js
[web] GET /packages/polymer/src/build/log_injector.css => polymer|lib/src/build/log_injector.css
[web] GET /packages/web_components/dart_support.js => web_components|lib/dart_support.js
[web] GET /packages/polymer/src/js/polymer/polymer.js => polymer|lib/src/js/polymer/polymer.js
[web] GET /packages/core_elements/src/core-focusable/polymer-mixin.js => core_elements|lib/src/core-focusable/polymer-mixin.js
[web] GET /packages/browser/dart.js => browser|lib/dart.js
[web] GET /packages/core_elements/src/core-focusable/core-focusable.js => core_elements|lib/src/core-focusable/core-focusable.js
[Error from InjectorGenerator on division|web/index.html_bootstrap.dart]:
Could not load asset division|web/components%255Csmall%255Cradio-group.dart
...