rxdosbio.asm compile error

Load Protection code causing compile error.

        ;''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''';
        ;  Load Protection                                              ;
        ;- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -;
        ;                                                               ;
        ;  Everything above this line must reside in the first 600 hex  ;
        ;  bytes of the file. This is the minimal portion loaded by the ;
        ;  bootstarp loader.                                            ;
        ;                                                               ;
        ;  The code below causes an error message in compile if the     ;
        ;  file size at this location will exceed 600 hex bytes.        ;
        ;...............................................................;

     IF1
       IF ($ GE 600h)
        error "RxDOSBIO minimal section exceeds 600h (3 sectors) bytes."

       ENDIF
     ENDIF