[Limdep Nlogit List] Problems with running MNL in NLOGIT v.5

[Alhassan Siiba]

 Dear All,
I am trying to run MNL model with coefficients in NLOGIT v. 5. However, I
kept on getting different error messages in that regard. Some of the error
messages are:

"Error    101: LOGIT - one of the cells (outcomes) has no observations".
"Error    221: The data on the LHS variable appear not to be coded 0,1,2.."

I am new to NLOGIT. I am using SP data with the dependent variable being
RANK for different travel modes and the Independent variables being the
attributes of the travel modes.
Please, can someone help me out? Thank you.
Kind regards, Siiba.