相关疑难解决方法(0)

我正在尝试将角度应用程序从5版本迁移到6版本。该应用程序运行良好，但是如果在重新加载页面后对代码进行了一些更改，那么我将遇到一个奇怪的错误：

core.js:1598 ERROR Error: Uncaught (in promise): TypeError: Cannot read property 'call' of undefined
TypeError: Cannot read property 'call' of undefined
    at __webpack_require__ (bootstrap:81)
    at Object../src/app/secure/dashboard/member-index/member-index.module.ngfactory.js (member-index.component.ts:33)
    at __webpack_require__ (bootstrap:81)
    at $_lazy_route_resource lazy namespace object:56
    at ZoneDelegate.push../node_modules/zone.js/dist/zone.js.ZoneDelegate.invoke (zone.js:388)
    at Object.onInvoke (core.js:4062)
    at ZoneDelegate.push../node_modules/zone.js/dist/zone.js.ZoneDelegate.invoke (zone.js:387)
    at Zone.push../node_modules/zone.js/dist/zone.js.Zone.run (zone.js:138)
    at zone.js:872
    at ZoneDelegate.push../node_modules/zone.js/dist/zone.js.ZoneDelegate.invokeTask (zone.js:421)
    at __webpack_require__ (bootstrap:81)
    at Object../src/app/secure/dashboard/member-index/member-index.module.ngfactory.js (member-index.component.ts:33)
    at __webpack_require__ (bootstrap:81)
    at $_lazy_route_resource lazy namespace object:56
    at ZoneDelegate.push../node_modules/zone.js/dist/zone.js.ZoneDelegate.invoke (zone.js:388)
    at Object.onInvoke (core.js:4062)
    at ZoneDelegate.push../node_modules/zone.js/dist/zone.js.ZoneDelegate.invoke (zone.js:387)
    at Zone.push../node_modules/zone.js/dist/zone.js.Zone.run (zone.js:138)
    at zone.js:872 …