When I try to use LME model. There is a code "mris_preproc --qdec-long qdec.table.dat --target fsaverage --hemi lh --meas thickness --out lh.thickness.mgh" in LME tutorials website under "b)Mass-univariate".

When I ran it, error happened:
"""
[mtobia@localhost PD]$ mris_preproc --qdec-long $SUBJECTS_DIR/sub_long.dat --target fsaverage --hemi lh --meas thickness --out lh.thickness.long.mgh
nsubjects = 80
ERROR: cannot find /HD4/PD/Patients_Symptom//.long.
"""

And I already check the file name, The folder name match <fsid>.long.<fsid_base>.

What should I do now?

Thanks for your help.