[flexcoders] Catching/Trapping Error #3003: File or directory does not exist

[sdl1326]

I am getting the following error:
Error #2044: Unhandled IOErrorEvent:. text=Error #3003: File or
directory does not exist
How can I trap this error? I have tried using a Try/Catch as well as a
listener - see code below:




try {

var sourceFile:File = new File();

sourceFile.addEventListener(IOErrorEvent.IO_ERROR,onSourceFileIoError);

sourceFile = File.desktopDirectory.resolvePath( model.networkDriveLetter
+ "\\" + event.payload.asset_location );

}
catch(e:Error){trace('an error has occurred')};



However, neither of these seems to trap the error. Suggestions?

Thanks, in advance.