freesurfer-Linux-centos4_x86_64-stable-pub-v5.3.0

After I have loaded my qdec.table.dat and renamed the analysis folder , when I then try to create the "stats tables", I get an error and it blocks at 20% of the waiting bar.

Data table loading completed successfully.

SUBJECTS_DIR is '~/Documents/ARNAUD/'

mkdir -p /usr/local/freesurfer/subjects/qdec/stats_tables/

mkdir: cannot create directory `/usr/local/freesurfer/subjects/qdec': Permission denied

ERROR: In /usr/pubsw/packages/KWWidgets/CVS-vtk560/KWWidgets/vtkKWTkUtilities.cxx, line 230

vtkKWQdecApp (0x289a94e0): 

    Script: 

vtkTemp2 GenerateStatsDataTables

    Returned Error on line 1: 

Uncaught exception: command failed: mkdir -p /usr/local/freesurfer/subjects/qdec/stats_tables/

Stack trace: 

Uncaught exception: command failed: mkdir -p /usr/local/freesurfer/subjects/qdec/stats_tables/

    while executing

"vtkTemp2 GenerateStatsDataTables"

It seems that it tries to write into the default SUBJECT_DIR, thing that I do not understand as I put the actual SUBJECT_DIR in the top line of qdec.table.dat (and it is correctly recognized in the qdec window SUBJECTS_DIR).

How could I come around that problem?

Thanks in advance!
Markus