I have been hearing about many issues where the player is loading but showing an error. When troubleshooting, the first thing you should check is the path to the flv. The flash var ‘movie’ does not like relative paths, your path must be absolute in order for the player to load and run the clip.

Example of Relative Path: ../../videos/mario.flv
Example of Absolute Path: http://www.website.com/videos/mario.flv