I can't seem to get COMRETURNERROR to work.

First, my class's ERROR code:

PROTECTED PROCEDURE Error(iError, sMethod, iLine)
		
  LOCAL sSource, sMessage
		
  WITH This

    ** Form the error strings
    sSource = TRANSFORM(iError) + CHR(13)+;
            sMethod+;
	    TRANSFORM(iLine)

    sMessage = "Error" 

    ** Populate the COM exception structure
    =COMRETURNERROR(sSource, sMessage)
	
   ENDWITH
		
ENDPROC

Next, in the INIT I placed:

PROCEDURE Init
		
  LOCAL sString
		
  sString = "Kevin"

  ** This will trigger the Error method
  ? DTOC(sString)
	
ENDPROC

And when I compile the DLL and instantiate the class, I get
"OLE error code 0x80004005: Unspecified error."

Shouldn't it be displaying my error string?