[TIMOB-26033] iOS: Ti.Media.VideoPlayer shows an error on Window Close on SDK 7.1.1.GA

   var win = Ti.UI.createWindow({
   	title : 'Starting Window',
   	backgroundColor: 'white'
   });
   
   var openLabel = Ti.UI.createLabel({
   	text : "Open Video Window",
   });
   
   openLabel.addEventListener('click', function(e) {
   	videoWin.open();
   });
   
   var videoWin = Ti.UI.createWindow({
   	title : 'Video window',
   	backgroundColor : '#a5a5a5'
   });
   
   var activeMovie = null;
   var playLabel = Ti.UI.createLabel({
   	text : "Play the video file",
   	top : 200,
   });
   playLabel.addEventListener('click', function(e) {
   	activeMovie = Titanium.Media.createVideoPlayer({
   		top : 100,
   		width : Ti.UI.FILL,
   		bottom : 200,
   		visible : true,
   		zIndex : 999999,
   		mediaControlStyle : Titanium.Media.VIDEO_CONTROL_DEFAULT,
   		scalingMode : Titanium.Media.VIDEO_SCALING_ASPECT_FILL,
   		autoplay : true,
   		elevation : 24,
   		url : 'https://www.w3schools.com/html/mov_bbb.mp4'
   	});
   	videoWin.add(activeMovie);
   });
   videoWin.add(playLabel);
   
   var closeLabel = Ti.UI.createLabel({
   	text : "Close Video Window",
   	bottom : 100,
   });
   closeLabel.addEventListener('click', function(e) {
   	if (activeMovie != null) {
   		activeMovie.release();
   		win.remove(activeMovie);
   	}
   	activeMovie = null;
   	videoWin.close();
   });
   videoWin.add(closeLabel);
   
   win.add(openLabel);
   win.open(); 
   

   var win = Ti.UI.createWindow({
   	title : 'Starting Window',
   	backgroundColor: 'white'
   });
   var videoWindow = Ti.UI.createLabel({
   	top : 300,
   	text : 'open video window'
   });
   videoWindow.addEventListener('click', function(e) {
   	var videoWin = Ti.UI.createWindow({
   		title : 'Video window',
   		backgroundColor : '#a5a5a5'
   	});
    
   	var videoFile = Titanium.Filesystem.getFile(Titanium.Filesystem.getApplicationDataDirectory(), 'Local_Ad_Video_File_1.MOV');
    
   	var saveLabel = Ti.UI.createLabel({
   		text : "Save a video file",
   		top : 200,
   	});
   	saveLabel.addEventListener('click', function(e) {
   		Ti.Media.showCamera({
   			mediaTypes : [Ti.Media.MEDIA_TYPE_VIDEO],
   			videoMaximumDuration : 300000,
   			videoQuality : Titanium.Media.QUALITY_MEDIUM,
   			saveToPhotoGallery : true,
   			allowEditing : false,
   			success : function(e) {
   				saveVideoLocal(e.media);
   			}
   		});
   		saveLabel.hide();
   		playLabel.show();
   	});
   	function saveVideoLocal(media) {
   		videoFile.write(media);
   	}
    
    
   	videoWin.add(saveLabel);
    
   	var activeMovie = null;
   	var playLabel = Ti.UI.createLabel({
   		text : "Play the video file",
   		top : 200,
   		visible : false
   	});
   	playLabel.addEventListener('click', function(e) {
   		activeMovie = Titanium.Media.createVideoPlayer({
   			top : 100,
   			width : Ti.UI.FILL,
   			bottom : 200,
   			visible : true,
   			zIndex : 999999,
   			mediaControlStyle : Titanium.Media.VIDEO_CONTROL_DEFAULT,
   			scalingMode : Titanium.Media.VIDEO_SCALING_ASPECT_FILL,
   			autoplay : true,
   			elevation : 24,
   			url : videoFile.nativePath
   		});
   		videoWin.add(activeMovie);
   		closeLabel.show();
   	});
   	videoWin.add(playLabel);
    
   	var closeLabel = Ti.UI.createLabel({
   		text : "Close Video Window",
   		bottom : 100,
   		visible : false
   	});
   	closeLabel.addEventListener('click', function(e) {
   		if (activeMovie != null) {
    
   			// THIS IS THE LINE THAT THROWS THE ERROR. Now in the docs it says:
   			//Releases the internal video resources immediately.
   			// This is not usually necessary but can help if you no longer need to use the player after it is used to help converse memory.
   			// It also says android 0.9 and iOS 0.9 but it is throwing the following error on iOS:
   			/*
    
   			[ERROR] Script Error {
   			[ERROR] column = 23;
   			[ERROR] line = 97;
   			[ERROR] message = "Cannot remove an observer <TiMediaVideoPlayerProxy 0x104016800> for the key path \"url\" from <TiMediaVideoPlayerProxy 0x104016800> because it is not registered
   			as an observer.";
   			[ERROR] }
    
   			*/
   			// On iOS: if I comment out the release line below it will not throw the error but documentation says it can help conserve memory if used.
    
   			activeMovie.release();
    
   			win.remove(activeMovie);
   		}
   		activeMovie = null;
   		videoWin.close();
   	});
   	videoWin.add(closeLabel);
    
   	videoWin.open();
   });
   win.add(videoWindow);
   win.open(); 
   

   APPC Studio: 5.0.0.201712081732
   APPC CLI: 7.0.4
   iphone 6 11.2 emulator
   Operating System Name: Mac OS High Sierra
   Operating System Version: 10.13
   Node.js Version: 8.9.1
   Xcode 9.2