[Freesurfer] why no answer?

I posted the following question again, since I didn't get any response.

I am trying to overlay group-averaged data (FSL) on an averaged anatomical brain (Freesurfer). I did the following,

mri_vol2surf --src AVG.gfeat/cope1.feat/thresh_zstat1.img --src_type analyze --srcreg register.dat --hemi lh --projfrac 0.5 --out AVG.gfeat/cope1.feat/thresh_zstat1-lh.w --out_type paint

and got the following error message,

MRISreadCurvature: could not open /home/nam/AVERAGE/average/surf/lh.thickness No such file or directory

In the surf directory, I DID find "lh.avg_thickness". Would someone please let me know how to remedy this?

Nam.