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Short answer: reduction modulo 3 not defined because you apply it to elements of Zmod(71), where it is indeed not defined.
Overall, the code does not quite make sense. For example, you define X via R.<X> = Zmod(n)[] as a variable in the polynomial ring over $\mathbb{Z}/71\mathbb{Z}$ and then you extract the coefficients of polynomial X via X[0] etc. and redefine X as a list of integers via X = psi(X). If you plan to work with lists integers, why do you even define polynomial rings?
