Angular2 - getting error as : `EXCEPTION: No Directive annotation found on MyComponent`

when i trying to import a directive from other file, i am getting the error as EXCEPTION: No Directive annotation found on MyComponent - how to solve this?

here is my code:

app.component.ts:

import {Component} from 'angular2/core';
import {MyComponent} from "./app.my-component"

@Component({
    selector: 'app',
    template: `
        <h1>Hellow World</h1>
        <span>Here is your component:</span>
        <my-component></my-component>
    `,
    directives: [MyComponent]
})

export class AppComponent { }

app.mycomponent.ts:

import {Component} from 'angular2/core';

@Component({

    selector : 'my-component',

    template : `<h2>This is from My component</h2>`

});

export class MyComponent { };

But i am getting error as : No Directive annotation found on MyComponent how to solve this?