Internal Assembler Error 24680. DSC-File vom Mega644?

Program TestADC;

{$NOSHADOW}
{ $WG}                     {global Warnings off}

Device = mega644, VCC=3.3;
{ $BOOTRST $07000}         {Reset Jump to $07000}

Import SysTick, SerPort;

From System Import;

Define
  ProcClock      = 8000000;       {Hertz}
  SysTick        = 10;            {msec}
  StackSize      = $0100, iData;
  FrameSize      = $0100, iData;

  SerPort        = 9600, ParNone, Stop1, Databit8;
  RxBuffer       = $FF, iData;
  TxBuffer       = $10, iData;

Implementation

{------------------------------------------------------------------------------}
{ Type Declarations }
Type
{------------------------------------------------------------------------------}
{ Const Declarations }
Const
{------------------------------------------------------------------------------}
{ Var Declarations }
{$IDATA}
Var
{------------------------------------------------------------------------------}
{ Main Program                                                                 }
Begin
  EnableInts;
  Loop
    EndLoop;
End TestADC.