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Hi
I have been attempting to perform just the smoothing step on a series of subjects using surf2surf and I seem to be getting an error when attempting to this. 

My command is as follows 

mri_surf2surf --hemi lh \
 --s fsaverage \
 --sval combat_lh-1004.thickness.fwhm0.fsaverage.mgh \
 --fwhm 10 \
 --cortex \
 --tval combatlh.thickness.fwhm10.fsaverage.mgh

I get this error 
ERROR: Option  --sval unknown

Based on other posts on the mailing list I tried specifying the src and trg subjects but still receive the following error: 

mri_surf2surf --hemi lh \ --srcsubject fsaverage \
--srcsurfval combat_lh-1004.thickness.fwhm0.fsaverage.mgh \ --fwhm 10 \
--trgsurfval combatlh.thickness.fwhm10.fsaverage.mgh

ERROR: Option  --srcsubject unknown

I was wondering if you might be able to help resolve this issue

Thank you very much!