I am assessing the merling package in Stata 14.2 for a "three-level survival model" and a "joint frailty model for recurrent and terminal events"

I get an error "initial values not feasible" for both datasets, therefore the package is not working.

Other commands such as stcox, shared (id) work fine

I would be very grateful to you if you could give me any hints on what I'm doing wrong or what I should do

Thanks