Unfortunately app stopped Error while starting Intent

I tried re creating the same scenario, created a layout for new Activity. When I start the Intent I am getting a series of logs, and in my emulator it says unfortunately app not working.

My Logs : Process: com.example.ragesh.mystory, PID: 8743 android.content.ActivityNotFoundException: Unable to find explicit activity class {com.example.ragesh.mystory/com.example.ragesh.mystory.StoryStart}; have you declared this activity in your AndroidManifest.xml? at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1761) at android.app.Instrumentation.execStartActivity(Instrumentation.java:1485) at android.app.Activity.startActivityForResult(Activity.java:3736) at android.app.Activity.startActivityForResult(Activity.java:3697) at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:817) at android.app.Activity.startActivity(Activity.java:4007) at android.app.Activity.startActivity(Activity.java:3975) at com.example.ragesh.mystory.MainActivity.startStory(MainActivity.java:41) at com.example.ragesh.mystory.MainActivity.access$000(MainActivity.java:15) at com.example.ragesh.mystory.MainActivity$1.onClick(MainActivity.java:31) at android.view.View.performClick(View.java:4756) at android.view.View$PerformClick.run(View.java:19749) at android.os.Handler.handleCallback(Handler.java:739) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:135) at android.app.ActivityThread.main(ActivityThread.java:5221) at java.lang.reflect.Method.invoke(Native Method) at java.lang.reflect.Method.invoke(Method.java:372) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)

MyCode :

public class MainActivity extends ActionBarActivity { private static final String TAG=MainActivity.class.getSimpleName();

private EditText enterNameWiget;
private Button startStoryButton;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    enterNameWiget=(EditText) findViewById(R.id.idEditText);
    startStoryButton=(Button) findViewById(R.id.idButton);
    startStoryButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            startStory();


        }
    });
}

private void startStory() {

    Intent intent=new Intent(MainActivity.this,StoryStart.class);
    startActivity(intent);
}

}