Method does not override method from its superclass

I'm new to Java and I'm learning app for Android and on my route, I ran into this error:

Method does not override method from its superclass

The word @Override is underlined in red, but I could not understand the error. Here is the code:

public class MainActivity extends Activity {

    @Override
    public void OnCreate(Bundle savedInstanceState){
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

    }
}