error with --dosage-compen

Hi,

I'm trying to carry out an assessment of different models (dosage compensations vs no dosage compensation) for X chromosome analysis in an African related population set of 5000 individuals. I've tried to update the X chromosome GRM several times, but keep getting the following error:

nfs/team149/Software/usr/share/gcta1.24/gcta64 --grm GRM_xchr --dosage-compen 1 --update-sex GRM_xchr.indi.sex.list --make-grm --out GRM_xchr_fdc
*******************************************************************
* Genome-wide Complex Trait Analysis (GCTA)
* version 1.24.4
* (C) 2010-2013 Jian Yang, Hong Lee, Michael Goddard and Peter Visscher
* The University of Queensland
* MIT License
*******************************************************************
Analysis started: Tue Sep 23 12:32:39 2014

Options:
--grm GRM_xchr


Error: invalid option "--dosage-compen".


Analysis finished: Tue Sep 23 12:32:39 2014
Computational time: 0:0:0

Has anyone encountered this error before? I would really appreciate any advice on this.

Thanks.

Best wishes,
Deepti