TiViedeoActivity not found

Hello,

I've been using Titanium Studio and TiVideoActivity on Windows without a problem, using this code:

var movie = Ti.Media.createVideoPlayer({
        url:'/video/compressed.mp4',
        movieControlMode:Ti.Media.VIDEO_CONTROL_DEFAULT,
        movieControlStyle:Ti.Media.VIDEO_CONTROL_FULLSCREEN,
        scalingMode:Ti.Media.VIDEO_SCALING_ASPECT_FIT,
        fullscreen:true,
        autoplay:true
    });

But when I try to run the same code using Titanium Studio on a MacOSX I get the following error:

android.content.ActivityNotFoundException:
Unable to find explicit activity class {com.platform.irescue/ti.modules.titanium.media.TiVideoActivity};
have you declared this activity in your AndroidManifest.xml?

Since I am a Titanium Studio newb, I have no idea what's going on. I have checked both TiApp.xml files on both Windoze and Mac, but they are the same. So why is this code working on one, but not on the other?