mri_glmfit \
 --glmdir lh.paired-diff \
 --y lh.paired-diff.thickness.sm05.mgh \
 --fsgd paired-diff.fsgd \
 --C mean.mtx \
 --C age.mtx

I've got an error "ERROR: you must use '--surface subject hemi' with surface data". 
Any idea how to fix it?

Below is the full output:

utente@RM-user:~/Documenti/Gayane/POCD_quantitative/freesurfer_pocd/longitudinal_2013/pairedAnalysis$ mri_glmfit --glmdir lh.paired-diff --y lh.paired-diff.thickness.sm05.mgh --fsgd paired-diff.fsgd --C mean.mtx --C age.mtx


gdfReadHeader: reading paired-diff.fsgd
INFO: ignoring tag ,9 
INFO: ignoring tag ,9 
INFO: ignoring tag ,3 
INFO: DeMeanFlag keyword not found, DeMeaning will NOT be done.
Continuous Variable Means (all subjects)


0 Age 57 11.0454
Class Means of each Continuous Variable
1 Main  57.0000 
INFO: gd2mtx_method is dods

$Id: mri_glmfit.c,v 1.196.2.6 2011/05/05 20:54:25 greve Exp $
cwd /home/utente/Documenti/Gayane/POCD_quantitative/freesurfer_pocd/longitudinal_2013/pairedAnalysis


cmdline mri_glmfit --glmdir lh.paired-diff --y lh.paired-diff.thickness.sm05.mgh --fsgd paired-diff.fsgd --C mean.mtx --C age.mtx 
sysname  Linux
hostname RM-user
machine  x86_64
user     utente
FixVertexAreaFlag = 1


UseMaskWithSmoothing     1
OneSampleGroupMean 0
y    /home/utente/Documenti/Gayane/POCD_quantitative/freesurfer_pocd/longitudinal_2013/pairedAnalysis/lh.paired-diff.thickness.sm05.mgh
logyflag 0
usedti  0

FSGD paired-diff.fsgd

glmdir lh.paired-diff
IllCondOK 0
ReScaleX 1
DoFFx 0
Creating output directory lh.paired-diff
Loading y from /home/utente/Documenti/Gayane/POCD_quantitative/freesurfer_pocd/longitudinal_2013/pairedAnalysis/lh.paired-diff.thickness.sm05.mgh


ERROR: you must use '--surface subject hemi' with surface data

Thanks for yuo help

Gayane