Hi Rajeev,
Usually, this type of error is produced if stats file is missed, check if aseg. stats file is there in directory "/usr/local/freesurfer/subjects/140/stats" directory.
If this file is missed in some subjects, you can add "--skip" to command line like;
asegstats2table --subjects 01 02 03 .... --meas volume --skip --statsfile wmparc.stats --all-segs --tablefile .......
Jamaan
Jamaan Alghamdi 07779801950 0151 795 4627 Magnetic Resonance & Image Analysis Research Centre (MARIARC) University of Liverpool Pembroke place Liverpool L69 3GE
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freesurfer@nmr.mgh.harvard.edu