Error Message Help

Could someone please tell me what this error message means and how to possibly fix it
"ERROR- Not enough individual covariates specified on the encounter history"
I've identified all my covariates (5) at the beginning of the set up, I've moved covariates around and still no luck.
Thanks in advance
LJB
"ERROR- Not enough individual covariates specified on the encounter history"
I've identified all my covariates (5) at the beginning of the set up, I've moved covariates around and still no luck.
Thanks in advance
LJB