Hi @firat,
the name must nor be exactly INSAR_master_date, but INSAR_20160425 if your master image has the date 2016 04 25 (example). I am a bit sceptical if all went correctly, because the processor should be set automatically to gamma, but maybe I have missed that setting the processor with setparm will work to. However, the warning you encountered Not enough random phase may come from two possibilities
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Your studysite is to small, with setparm(‘filter_grid_size’, 10) I am able to run the script for small areas. But I would recommend to work with larger areas.
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You can also try to set the dispersion index to a higher threshold, in mt_prep_gamma_snap 0.45 for example, more PS candidates will be preselected
have a try with filter_grid_size or a larger subset of your studysite and let us know if this fixed your problem or not.
Good luck!