problem for play the file for 3rd edition

Hello friends,

I am doing an application (in 3rd edition)which will play a file by using

CDrmPlayerUtility* NewFilePlayerL(const TDesC& aFileName,MDrmAudioPlayerCallback& aCallback,TInt aPriority,
            TMdaPriorityPreference aPref);
it is working

but when i use
// Following code segment is used for reading the file -

   RFs aFs;
//   HBufC8 *      SmsFileData;
//   TPtr8            bufferPtr;
   aFs.Connect();
   RFile aFile;
   TInt result  =    aFile.Open(aFs,aAudioFilename,EFileShareAny);
   if ( result == KErrNone)
   {
      TInt         Size = 0;
      aFile.Size(Size);
      SmsFileData = HBufC8::NewL(Size+20);
      TPtr8 bufferPtr     = SmsFileData->Des();
      aFile.Read(bufferPtr);
      aFile.Close();
   
   aFs.Close();
   SmsFileData->Des()=bufferPtr;

//- for play the File
1)
   iPlayer0 = CDrmPlayerUtility::NewDesPlayerReadOnlyL( SmsFileData->Des(),*this,80,(TMdaPriorityPreference) 0x00060001 );
it gives User 23 error
iPlayer0->Play();
2)
   CDrmPlayerUtility* NewDesPlayerReadOnlyL(SmsFileData->Des(),*this,80,(TMdaPriorityPreference) 0x00060001 );
it gives User 23 error
iPlayer0->Play();


it is not working
Any body knows about this problem.
Any solution is there?