LOGISTIC REGRESSION AIC Calculation

Hi when I try to run StepAIC algorithm I get the output. But along with the each iteration for AIC calculation.I do get the following warning message. Anyone know what does it mean?

" glm.fit: fitted probabilities numerically 0 or 1 occurredglm.fit: algorithm did not convergeglm.fit: fitted probabilities numerically 0 or 1 occurredglm.fit: algorithm did not convergeglm.fit: fitted probabilities numerically 0 or 1 occurred "

There's an informative discussion of the error in the answer (you can ignore the question) to this CrossValidated post.

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