错误：注入()必须从注入上下文中调用 - 升级后的angular 8到9

Question

我把我的Angular应用从8升级到9，并启用了Ivy。现在应用程序是正确的构建，但当我做ng服务时，我在控制台得到一个错误--。

Error: inject() must be called from an injection context
    at injectInjectorOnly (VM29 vendor.js:32922)
    at Module.ɵɵinject (VM29 vendor.js:32933)
    at Object.A11yModule_Factory [as factory] (VM29 vendor.js:8401)
    at R3Injector.push.../../node_modules/@angular/core/__ivy_ngcc__/fesm5/core.js.R3Injector.hydrate (VM29 vendor.js:195954)
    at R3Injector.push.../../node_modules/@angular/core/__ivy_ngcc__/fesm5/core.js.R3Injector.get (VM29 vendor.js:195771)
    at VM29 vendor.js:195809
    at Set.forEach (<anonymous>)
    at R3Injector.push.../../node_modules/@angular/core/__ivy_ngcc__/fesm5/core.js.R3Injector._resolveInjectorDefTypes (VM29 vendor.js:195809)
    at new NgModuleRef$1 (VM29 vendor.js:209242)
    at NgModuleFactory.push.../../node_modules/@angular/core/__ivy_ngcc__/fesm5/core.js.NgModuleFactory.create (VM29 vendor.js:209302)

Angular。

"@angular-devkit/build-angular": "0.901.1",
"@angular-devkit/build-ng-packagr": "~0.901.1",
"@angular/cli": "^9.0.1",
"@angular/compiler-cli": "^9.1.1",

有人知道吗？任何帮助将被感激。

Answer 1

我不知道根本原因和发生了什么。我只是删除了工作区，然后git再次克隆了项目，这个问题已经消失了。