debugging error

poissonresults=sm.GLM(y_train,X_train,family=sm.families.Poisson()).fit() after running this command i got "perfect seperation error".
what that means and how can it be resolved

The issue names no repository file, test, or notebook reproducer; it only shows a Python statsmodels GLM call and a perfect-separation error. First verify whether this belongs to Jupyter Notebook or to the modeling library that raises the error. Done would require a minimal reproducible example and a clearly identified, actionable repository change.

Written by the indexing model from the issue text.