[Limdep Nlogit List] Data set problem

[medard kakuru]

Dear Users, I am facing a challenge with re-running an analysis I did 3
years a go. my data set has 540 observations. Three years a go, I run a MNL
model with no challenges. When I trying running the same model on the same
data set, the output shows that only 180 observations are used. I have
checked my data set over and over again but don’t see any problem. kindly
help me out.
Thanks.