[Freesurfer] lh.white.H , Failed to create

Dear all ,

I have been incurring lot of problems while running recon-all on ubuntu 16.04 , recon-all throws following error :

" #@# Curv .H and .K lh Sa 25. Feb 04:09:16 CET 2017 /media/vasudev/vkirsch4/Project_BLVP/HCP_Proj/KON2/T1w/KON2/surf

mris_curvature -w lh.white.preaparc

total integrated curvature = 8.913*4pi (112.005) --> -8 handles ICI = 172.8, FI = 1966.7, variation=30317.492 writing Gaussian curvature to ./lh.white.preaparc.K...done. writing mean curvature to ./lh.white.preaparc.H...done. rm -f lh.white.H ln -s lh.white.preaparc.H lh.white.H ln: failed to create symbolic link 'lh.white.H': Function not implemented "

Could you please let me know why this error is occurring .

Thanks Vasudev