Hash mismatch so recompiling; make sure Stan code ends with a blank line

General
1

Facing this error problem “hash mismatch so recompiling; make sure Stan code ends with a blank line” when I run the stan function in r.

model {
  tau ~ exponential(0.03);
  for (m in 1:M){
    y[m] ~ exponential(1/tau);
  }
  phi ~ normal(0,5);
  kappa ~ normal(0,0.5);
  mu ~ normal(3.28, kappa); // citation: https://academic.oup.com/jtm/article/27/2/taaa021/5735319
  alpha_hier ~ gamma(.1667,1);
  ifr_noise ~ normal(1,0.1);
  for(m in 1:M){
    deaths[EpidemicStart[m]:N[m], m] ~ neg_binomial_2(E_deaths[EpidemicStart[m]:N[m], m], phi);
   }
}

generated quantities {
    matrix[N2, M] prediction0 = rep_matrix(0,N2,M);
    matrix[N2, M] E_deaths0  = rep_matrix(0,N2,M);
    
    {
      matrix[N2,M] cumm_sum0 = rep_matrix(0,N2,M);
      for (m in 1:M){
         for (i in 2:N0){
           cumm_sum0[i,m] = cumm_sum0[i-1,m] + y[m]; 
        }
        prediction0[1:N0,m] = rep_vector(y[m],N0); 
        for (i in (N0+1):N2) {
	  real convolution0 = 0;
	  for (j in 1:(i-1)) {		
            convolution0 += prediction0[j, m] * SI[i-j];
          }
          cumm_sum0[i,m] = cumm_sum0[i-1,m] + prediction0[i-1,m];
          prediction0[i, m] = ((pop[m]-cumm_sum0[i,m]) / pop[m]) * mu[m] * convolution0;
        }
        E_deaths0[1, m]= prediction0[1,m];
        for (i in 2:N2){
          for (j in 1:(i-1)) {		
            E_deaths0[i,m] += prediction0[j, m] * f[i-j,m] * ifr_noise[m];
          }
        }
      }
    }
}

base.stan (3.6 KB)

2

That’s not really an error. It’s just rstan saying that the Stan code has changed since the last time it was called, so it will be recompiled