[Freesurfer] ERROR: QdecGlmDesign::Create: zero factors!

Dear freesurfer user,

I'm new in this freesurfer and i want to analysis of the thickness of two groups, dementia and normal.

I was trying to use qdec but when i pressed "analyze" button, there was some message at the bottom, which is "Error during design creation".

At the same time, on the terminal, the following message came up.

"ERROR: QdecGlmDesign::Create: zero factors! "

For details, See below.

Please let me know what the problem is.

Thanks.

*M.J. *

------------------------------------------------ Reading /Applications/freesurfer/tktools/tkUtils.tcl

Using /Applications/freesurfer/lib/tcl/fsgdfPlot.tcl

Loading data table /Applications/freesurfer/subjects/qdec.table.dat... Number of columns: 3 fsid column: 1 Number of factors: 2 Number of subjects: 10 Reading discrete factor levels from config file /Applications/freesurfer/subjects/diagnosis.levels AD Normal done.

Data table /Applications/freesurfer/subjects/qdec.table.dat loaded. Verifying subject data..........Subject verification complete. Input table: /Applications/freesurfer/subjects/qdec.table.dat Subj#, SubjID, Data... 1 a1002 AD 75.000000 2 a1003 AD 63.000000 3 a1009 AD 71.000000 4 a1015 AD 80.000000 5 a1019 AD 75.000000 6 n1004 Normal 72.000000 7 n1005 Normal 71.000000 8 n1006 Normal 57.000000 9 n1007 Normal 62.000000 10 n1008 Normal 62.000000 1 diagnosis discrete 2 1 AD 2 Normal 2 age continuous 0 Continuous Factors: Mean: StdDev: ------------------- ----- -------

age 68.800 7.361

Number of subjects: 10 Number of factors: 2 (1 discrete, 1 continuous) Number of classes: 2 Number of regressors: 4

============================================================ Data table loading completed successfully. SUBJECTS_DIR is '/Applications/freesurfer/subjects' ERROR: QdecGlmDesign::Create: zero factors!