Dear expert users, 

I have launched SDM for the first time on a Mac using OSx, but it seems that SDM can't see the MRIcron software file (.app): it always shows the red X near to the bar that specifies the directory file, even if I try to select another executable file (please see the image attached) included on the contents folder of MRIcron program. However, MRIcron works normally when I open it separately. 
Has anyone already faced this problem? 

Thanks to you all, 
greetings, 
Giulia.