here is my terminal output:

register: ### can't create file NULL/rgb/NULL

I think maybe this is a very stupid question:)

De : Hao wen
Envoyé : mardi 7 juin 2016 10:27:07
À : freesurfer@nmr.mgh.harvard.edu; Bruce Fischl
Objet : Save REG in tkregister2
 

Hello:

I am using tkregister2 to do some manual registration, but I can not save reg with the button in the GUI