the AngularPlayList example error

[anjone]

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Hi, when I run the AngularPlayList example,get these errors

zone.js:461 Unhandled Promise rejection: Template parse errors: Can't bind to 'ngModel' since it isn't a known property of 'input'. (" required placeholder="title" [ERROR ->][(ngModel)]="video.title" > "): VideoDetailComponent@14:20 Can't bind to 'ngModel' since it isn't a known property of 'input'. (" required placeholder="url" [ERROR ->][(ngModel)]="video.url" > "): VideoDetailComponent@23:20 Can't bind to 'ngModel' since it isn't a known property of 'textarea'. ("

<textarea class="form-control" rows="5" [ERROR ->][(ngModel)]="video.desc">

        </textarea>

"): VideoDetailComponent@27:52 ; Zone: ; Task: Promise.then ; Value: BaseException {message: "Template parse errors:↵Can't bind to 'ngModel' sin… ↵"): VideoDetailComponent@27:52", stack: "Error: Template parse errors:↵Can't bind to 'ngMod….1:8080/node_modules/zone.js/dist/zone.js:356:38)"}message: "Template parse errors:↵Can't bind to 'ngModel' since it isn't a known property of 'input'. ("↵ required ↵ placeholder="title" ↵ [ERROR ->][(ngModel)]="video.title" ↵ > ↵

↵"): VideoDetailComponent@14:20↵Can't bind to 'ngModel' since it isn't a known property of 'input'. ("↵ required ↵ placeholder="url" ↵ [ERROR ->][(ngModel)]="video.url" ↵ > ↵ ↵"): VideoDetailComponent@23:20↵Can't bind to 'ngModel' since it isn't a known property of 'textarea'. (" ↵

↵ <textarea class="form-control" rows="5" [ERROR ->][(ngModel)]="video.desc"> ↵
↵ ↵"): VideoDetailComponent@27:52"stack: "Error: Template parse errors:↵Can't bind to 'ngModel' since it isn't a known property of 'input'. ("↵ required ↵ placeholder="title" ↵ [ERROR ->][(ngModel)]="video.title" ↵ > ↵

↵"): VideoDetailComponent@14:20↵Can't bind to 'ngModel' since it isn't a known property of 'input'. ("↵ required ↵ placeholder="url" ↵ [ERROR ->][(ngModel)]="video.url" ↵ > ↵ ↵"): VideoDetailComponent@23:20↵Can't bind to 'ngModel' since it isn't a known property of 'textarea'. (" ↵

↵ <textarea class="form-control" rows="5" [ERROR ->][(ngModel)]="video.desc"> ↵
↵ ↵"): VideoDetailComponent@27:52↵ at new BaseException (http://127.0.0.1:8080/node_modules/@angular/compiler/src/facade/exceptions.js:27:23)↵ at TemplateParser.parse (http://127.0.0.1:8080/node_modules/@angular/compiler/src/template_parser/template_parser.js:98:19)↵ at RuntimeCompiler._compileTemplate (http://127.0.0.1:8080/node_modules/@angular/compiler/src/runtime_compiler.js:246:51)↵ at eval (http://127.0.0.1:8080/node_modules/@angular/compiler/src/runtime_compiler.js:174:83)↵ at Set.forEach (native)↵ at compile (http://127.0.0.1:8080/node_modules/@angular/compiler/src/runtime_compiler.js:174:47)↵ at ZoneDelegate.invoke (http://127.0.0.1:8080/node_modules/zone.js/dist/zone.js:323:29)↵ at Zone.run (http://127.0.0.1:8080/node_modules/zone.js/dist/zone.js:216:44)↵ at http://127.0.0.1:8080/node_modules/zone.js/dist/zone.js:571:58↵ at ZoneDelegate.invokeTask (http://127.0.0.1:8080/node_modules/zone.js/dist/zone.js:356:38)"proto: ErrorconsoleError @ zone.js:461_loop_1 @ zone.js:490drainMicroTaskQueue @ zone.js:494ZoneTask.invoke @ zone.js:426 zone.js:463 Error: Uncaught (in promise): Template parse errors:(…)consoleError @ zone.js:463_loop_1 @ zone.js:490drainMicroTaskQueue @ zone.js:494ZoneTask.invoke @ zone.js:426