使用stata 13做 meologit回归，为啥会出现下面的结果呢？

Fitting fixed-effects model:

Iteration 0:   log likelihood        =        -97589.025         
Iteration 1:   log likelihood        =        -97589.025         

Refining starting values:

Grid node 0:   log likelihood        =        -97076.583

Fitting full model:

initial values not feasible
r(1400);