The problem of error is an old argument for atheism that can be found in Medieval and Early Modern Philosophy. Although it is not widely discussed in the contemporary literature in the Philosophy of Religion, I resurrect it and give it a modern spin. By relying on empirical studies in moral psychology that demonstrate that moral judgments from human beings are generally susceptible to certain psychological biases, such as framing and order effects, I claim that if God is responsible for (...) making human beings such that we have these biases, this means that God is not a perfect being. The findings in empirical moral psychology create a problem for the existence of God, traditionally conceived. (shrink)