The first error to look at is this one:
Chain 1: Exception: ordered_logistic: Random variable is 4, but must be in the interval [1, 3] (in ‘model104828d26380_asime’ at line 57)
This error message is saying that when N_cat[n] == 2, the corresponding y[n] can only be 1, 2, or 3 (i.e. two cutpoints implies three categories) but the y[n] being provided is a 4.
You should check your data to make sure that the right N_cat is associated with the right y