Thank you Benjamin.
Sorry to have misunderstood...
I changed the path as you said. The paths after opening the toolbox inside SPM12 are :

F:\spm12\toolbox\wfu_results
F:\spm12\toolbox\wfu_tbx_common\spm_lite
F:\spm12\toolbox\wfu_tbx_common
F:\spm12\matlabbatch\cfg_basicio
F:\spm12\toolbox\deface
F:\spm12\toolbox\Shoot
F:\spm12\toolbox\OldSeg
F:\spm12\toolbox\OldNorm
F:\spm12\toolbox\Longitudinal
F:\spm12\toolbox\FieldMap
F:\spm12\toolbox\DARTEL
F:\spm12\config
F:\spm12\matlabbatch
F:\SnPM13
F:\spm12\toolbox\wfu_pickatlas
F:\spm12
….

but impossible to close spm :
??? Error using ==> wfu_spm at 169
Unknown action string ('Quit'). It possible that F:\spm12\toolbox\wfu_tbx_common\spm_lite is incorrectory listed in
your path and should be removed.

Error in ==> spm at 9
wfu_spm(varargin{:});
??? Error while evaluating uicontrol Callback

---------

when opening spm12 (before opening wfu_pickatlas), paths are :
F:\spm12\matlabbatch\cfg_basicio
F:\spm12\toolbox\deface
F:\spm12\toolbox\Shoot
F:\spm12\toolbox\OldSeg
F:\spm12\toolbox\OldNorm
F:\spm12\toolbox\Longitudinal
F:\spm12\toolbox\FieldMap
F:\spm12\toolbox\DARTEL
F:\spm12\config
F:\spm12\matlabbatch
F:\SnPM13
F:\spm12\toolbox\wfu_pickatlas
F:\spm12
...

----
I tested the same thing with matlab8.3 and I can't close spm :

Error using fileparts
Too many output arguments.

Error in wfu_spm (line 168)
[l_path file ext junk] = fileparts(x);
Error in spm (line 9)
wfu_spm(varargin{:});
Error while evaluating uicontrol Callback