Royale : Undefined FileReaer & Blob

[prashaku...@gmail.com]

Hi,

I am trying to  Image preview with Royale  and used  Royale FileAPI but gettign 
following error. Please suggest.
 var fileReader:FileReader = new FileReader();
 fileReader.addEventListener("onload",onFileLoad);
 fileReader.readAsDataURL((fileProxy.model as FileModel).blob as Blob);


Error: Type was not found or was not a compile-time constant: FileReader.

                var fileReader:FileReader = new FileReader();
                               ^
d:\ApacheFlex\workspace\FileUpload\src\FileUpload.mxml(34): col: 49 Error: Call 
to a possibly undefined method FileReader.

                var fileReader:FileReader = new FileReader();
                                                ^
d:\ApacheFlex\workspace\FileUpload\src\FileUpload.mxml(36): col: 81 Error: 
Access of possibly undefined property Blob.
                fileReader.readAsDataURL((fileProxy.model as FileModel).blob as 
Blob);

Thanks,
Prashant Kumar