When embedding MovieClips (with only one frame) from Flash .swf file into your Flex projects, you can fall into runtime issues:
[Embed(source="assets/preloader.swf", symbol="preloader")] public static const PRELOADER_CLASS:Class; MovieClip(new Assets.PRELOADER_CLASS());
TypeError: Error #1034: Type Coercion failed: cannot convert *** to flash.display.MovieClip.
Why coercion failed when my symbol is for sure MovieClip? The answer is simple:
Flash will type the symbol based on the number of frames in it’s timeline. If the symbol has only 1 frame it will be typed as a Sprite, 2 or more frames it will be typed as a MovieClip.
- add 1 more frame (so the frame count is more than 1)
- or cast embedded asset as flash.display.Sprite (prefered while there is no need for MovieClip with one usable frame + Sprite container consumes less memory)
The day is saved thanks to Felix Turner.