How am I suppose to get the log of the bayes model?

I'm always getting math.domain error

Decisions using a Naive Bayes model Suppose you are given a text, which is just a list of word tokens, x=[x1,,xn]. You want to decide whether this text is a positive movie review or a negative review. According to EstimatedClass=posifP(Class=posText=x)>P(Class=negText=x)negifP(Class=posText=x)