我已将应用程序从Angular2升级到Angular 4。在此之前，包括路由在内的所有功能都可以正常运行，但是现在升级之后，路由已停止，并且每当我单击任何链接时，重定向都会失败并出现错误：
Error: Uncaught (in promise): Error: Cannot activate an already activated outlet Error: Cannot activate an already activated outlet at k (http://localhost:3000/node_modules/zone.js/dist/zone.min.js:1:12455) at RouterOutlet.activateWith (http://localhost:3000/node_modules/@angular/router/bundles/router.umd.js:5368:19) at ActivateRoutes.placeComponentIntoOutlet (http://localhost:3000/node_modules/@angular/router/bundles/router.umd.js:4558:16) at ActivateRoutes.activateRoutes (http://localhost:3000/node_modules/@angular/router/bundles/router.umd.js:4539:26) at eval (http://localhost:3000/node_modules/@angular/router/bundles/router.umd.js:4475:58) at Array.forEach (native) at ActivateRoutes.activateChildRoutes (http://localhost:3000/node_modules/@angular/router/bundles/router.umd.js:4475:29) at ActivateRoutes.activate (http://localhost:3000/node_modules/@angular/router/bundles/router.umd.js:4449:14) at eval (http://localhost:3000/node_modules/@angular/router/bundles/router.umd.js:4066:22) at SafeSubscriber.eval [as _next] (http://localhost:3000/node_modules/rxjs/Observable.js:110:21) at SafeSubscriber.__tryOrSetError (http://localhost:3000/node_modules/rxjs/Subscriber.js:245:16) at SafeSubscriber.next (http://localhost:3000/node_modules/rxjs/Subscriber.js:187:27) at Subscriber._next (http://localhost:3000/node_modules/rxjs/Subscriber.js:125:26) at Subscriber.next (http://localhost:3000/node_modules/rxjs/Subscriber.js:89:18) at MapSubscriber._next (http://localhost:3000/node_modules/rxjs/operator/map.js:83:26) at k (http://localhost:3000/node_modules/zone.js/dist/zone.min.js:1:12455) at RouterOutlet.activateWith (http://localhost:3000/node_modules/@angular/router/bundles/router.umd.js:5368:19) at ActivateRoutes.placeComponentIntoOutlet (http://localhost:3000/node_modules/@angular/router/bundles/router.umd.js:4558:16) at ActivateRoutes.activateRoutes (http://localhost:3000/node_modules/@angular/router/bundles/router.umd.js:4539:26) at …在发出API请求之前,我需要在SHA256中加密我的密码.我无法在Angular2中找到任何SHA-256的实现