Parser expected stan error

I am trying to find the parameters p0 and p1 and am getting the error ‘PARSER EXPECTED: ’ on the model equation with y ~. Any advice on why?

data {
  int<lower=0> N;
  vector[N] y;
  vector[N] d;

parameters {
  real p0;
  real<lower=p0> p1;

model {
  p0 ~ beta(0.5,0.5);
  p1 ~ beta(0.5,0.5);
  y ~ 1/(1+exp(-logit(p0)-(logit(p1)-logit(p0))*d));

The right-hand side of that statement is just a number. It needs to be some statistical distribution.

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