"Call to Node module failed with error"s with Angular2 & ASP.NET

I'm getting an intermittent exception with my ASP.NET Core Angular 2 web-app: ``` Exception: Call to Node module failed with error: Error: This method is not implemented in Parse5DomAdapter: Parse5DomAdapter#getCookie at _notImplemented (D:\Projects\MyProject\MyProject\node_modules\angular2-platform-node\parse5-adapter.js:22:12) at Parse5DomAdapter.getCookie (D:\Projects\MyProject\MyProject\node_modules\angular2-platform-node\parse5-adapter.js:641:15) at CookieXSRFStrategy.configureRequest (D:\Projects\MyProject\MyProject\node_modules\@angular\http\bundles\http.umd.js:1597:92) at XHRBackend.createConnection (D:\Projects\MyProject\MyProject\node_modules\@angular\http\bundles\http.umd.js:1637:32) at httpRequest (D:\Projects\MyProject\MyProject\node_modules\@angular\http\bundles\http.umd.js:1975:24) at Http.get (D:\Projects\MyProject\MyProject\node_modules\@angular\http\bundles\http.umd.js:2086:20) at ApiService.getChatMessages (D:\Projects\MyProject\MyProject\ClientApp\dist\main-server.js:557:20) at ChatPageComponent.ngOnInit (D:\Projects\MyProject\MyProject\ClientApp\dist\main-server.js:513:23) at AppView._View_ChatPageComponent_Host0.detectChangesInternal (ChatPageComponent_Host.ngfactory.js:30:86) at AppView.detectChanges (D:\Projects\MyProject\MyProject\node_modules\@angular\core\bundles\core.umd.js:9566:18) MoveNext ``` I believe it's something to do with the MVC views, as the error shows: ``` MoveNext in Index.cshtml 1.@{ 2. ViewData["Title"] = "Home Page"; 3.} 4. 5.<app asp-prerender-module="ClientApp/dist/main-server">Loading...</app> 6. 7.<script src="~/dist/vendor.js" asp-append-version="true"></script> 8.@section scripts { ``` Which is code in my index.cshtml. It seems to happen early on after launching the project. It all either works fine, or after loading the home page when any navagation is performed it throws an error. I can force it to produce the error. I have 4 navagation destinations: ``` http://localhost:49954/home http://localhost:49954/counter http://localhost:49954/fetch-data http://localhost:49954/chat-page ``` That were all set up from the Visual Studio Angular 2 template. If I refresh home, everything is fine, and if it's had a chance to load for a while I can navagate to the other pages. However if I type in the url for any of the other pages, it produces this error every single time. Edit: Also, interestingly, it produces a slightly different error with `http://localhost:49954/counter`. In my counter page I use an Angular Material Design component: ``` <div class="mine"> <h2> Counter Test </h2> <p>This is a simple example of an Angular 2 component.</p> <p>Current count:<strong>{{ currentCount }}</strong></p> <button md-raised-button (click)="incrementCounter()">Increment</button> </div> ``` and instead of the above error, it's a similar Call to Node module failed error, but in material design: ``` Exception: Call to Node module failed with error: Error: Uncaught (in promise): ReferenceError: document is not defined ReferenceError: document is not defined at new RippleRenderer (D:\Projects\MyProject\MyProject\node_modules\@angular\material\material.umd.js:193:31) ```