StageWebView on iOS crashes when loading local files

Using SDK 21 onwards, ios app crashes when stageWebView attempts to load local files. This worked prior to SDK 21. I am working on Windows.

I've tried loading external files and webpages, and that works fine. When loading local images and videos, the app crashes instantly.

Has anyone come across a fix? And for a short term aid, does anyone have suggestions on another way to load local video files using native video player?

Example:

webView.stage = this.stage;

webView.viewPort = new Rectangle(0, (stage.stageHeight-videoHeight)/2, videoWidth, videoHeight);

var dir:File = File.applicationDirectory.resolvePath("videoAssets/"+model.videoToPlay);

webView.addEventListener(ErrorEvent.ERROR, traceError);

webView.loadURL(dir.nativePath); // Crashes here