When you get error #2124 flowplayer is trying to load a file, but most likely the file is not found and getting an Http 404 error code. Most often this error is a result of a missing file on your webserver.
I have found it is easiest to debug these types of issues by using the adobe debug version of flash - because you will see the exception pop up on the screen. Or, use firebug to watch the "net" tab and see what requests are being made which fail.
You can get the debug version of adobe in the "Adobe Flash Player 10 ? Debugger Versions (aka debug players or content debuggers)" section on this page:http://www.adobe.com/support/flashplayer/downloads.html
I have found it is easiest to debug these types of issues by using the adobe debug version of flash - because you will see the exception pop up on the screen. Or, use firebug to watch the "net" tab and see what requests are being made which fail.
You can get the debug version of adobe in the "Adobe Flash Player 10 ? Debugger Versions (aka debug players or content debuggers)" section on this page:http://www.adobe.com/support/flashplayer/downloads.html