Hmm. According to the error lines and the error the problem is that the following character is at the same place as the target (the distance to the target is 0 and that's why the division by zero error occurs). What have you typed in the text fields? I assume you selected the figure that will follow the target before running the script. You should always position the figure that follows the target by using the dials of the Body actor, not the Hip. Also, if you position the target with the Hip dials you should also set the target actor as Hip, not Body.