Dear STATA users,

I am very new to stata, so maybe this is a dumb question. I am trying to create a discrete choice model with cmmixlogit based on 444 routes who each have four alternatives. Any time i try to estimate more than four spatial variables in one model, i get the error that the input values are not feasible. It is even worse for interaction effects, sometimes i can't even estimate the interaction effect of one age variable on spatial variable on route choice. How do i solve this problem?

The code snippet that does work is cmmixlogit choice green_len aesthetic bridge_len waterperc light length, noconstant nolog or
However this does not: cmmixlogit choice aesthetic c.aesthetic#i.gender, noconstant nolog or